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Youtrechus zijunae n. sp. Figures 1n, 2–4 Material. Holotype male, 29.73 °N / 114.24 °E, 160 m, a limestone cave called Feixian Dong, Xian’an District, Xianning, Hubei, 2019. VII. 13, Mingyi Tian, Mengzhen Chen, Zijun Ma & Jingli Cheng leg., in SCAU; paratypes: 10 males and 3 females, idem, in SCAU. Diagnosis. Semi-aphenopsian and medium to large sized for cave trechines, with moderately elongated body and appendages, eyeless and depigmented; fore part (head plus prothorax) evidently shorter than elytra, surface smooth. Description. Length: 6.5–6.9 mm; width: 1.9–2.1mm. Habitus as in Figure 2. Body yellowish brown, but antennae, mouthparts palps and tarsi pale; moderately shiny and whole body glabrous though genae with a few setae; microsculptural engraved meshes isodiametric on head, transverse striate on pronotum and elytra; fore body much shorter than elytra, (HLm+PL) / EL = 0. 80–0.82. Head stout, slightly longer than wide, HLm/HW = 1.58–1.64, HLl/HW = 1.16–1.22; genae fairly developed, slightly expanded, widest at about 1/3 of head from neck to apical margin of labrum; frons rather flat, vertex convex, frontal furrows widely and strongly divergent posteriad; clypeus transverse, quadrisetose; labrum transverse, frontal margin slightly emarginate, 6-setose; two pairs of supraorbital setiferous pores present at about middle and 1/4 of head from labrum; labial suture clearly visible, mentum bisetose on either side of tooth, mental tooth short and blunt at tip, basal fovea widely concave; submentum 6-setose; ligula thick and short, bisetose at apex; palps moderately elongated, 2 nd labial palpomere 1.3 times as long as 3 rd, the former bisetose on inner margin, with a seta medially on outer margin and another on out subapex, the latter glabrous; 3 rd maxillary palpomere 1.1 times as long as 4 th, both glabrous; suborbital pore just between base and submentum (Figure 3A). Antennae thin and rather long, but not extended beyond elytral apices, longer in male; the 1 st antennomere stouter, as long as the 2 nd, the 3 rd – 5 th longest, the 11 th slightly longer than 10 th, the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.17) / 3 rd (1.83) / 4 th (1.78) / 5 th (1.89) / 6 th (1.67) / 7 th (1.61) / 8 th (1.44) / 9 th (1.39) / 10 th (1.28) /11 th (1.56). Pronotum quadrate, slightly longer than wide, PL/PW =1.07–1.11; wider than head, PW/HW = 1.21–1.23, slightly longer than head excluding mandibles, PL/HLl = 1.03–1.05; widest a little before middle, gently narrowed anteriorly and posteriorly, latero-margins finely bordered; front slightly concave, the base is prominent, with the presence of secondary angles, strongly sinuate on sides, making a sharp, though rectangular, hind angle on each side; anterior latero-marginal setae at about apical 1/8, posterior ones just on hind angles; disc moderately convex; median line well-defined, basal transversal impression and foveae well-marked. Scutellum fairly small. Elytra elongated ovate, much longer than wide,EL/EW=1.64–1.66; much wider than pronotum,EW/PnW=1.75– 1.76; widest at about 3/7 of elytra from base, lateral sides smooth, finely bordered throughout, marginal gutters wellmarked; slightly depressed medially near base, disc moderately convex; punctures of striae invisible, intervals more or less subequal in width except 1 st one. Chaetotaxy (Figure 3B): anterior and medial dorsal pores located on 3 rd stria, at about 2/13 and 4/13 of elytra from base respectively; posterior dorsal pore located on 5 th interval at about 6/13 of elytra from base; the preapical pore located at the apical anastomosis of 2 nd and 3 rd striae, and at about apical 2/13 of elytra, much closer to elytral suture than to apical margin; basal pore present; 1 st and 2 nd marginal umbilicate close to marginal gutter; 4 th pore distant from 3 rd; 5 th and 6 th pores located at about middle of elytra, close to each other; 7 th, 8 th and apical pores distant from marginal gutter; the anguloapical one present, subequal to elytral margin and suture. Legs thin and slender, bearing short pubescence; the 1 st and 2 nd protarsomeres widened in male, distinctly denticulate inwardly; the 1 st protarsomere distinctly widened in female; the 1 st tarsomere much shorter than 2 nd –4 th tarsomeres together in fore leg, whereas as long as those in middle and hind legs respectively. Ventrites smooth, IV–VI each with two pairs of paramedial setae, together with several pubescence in middle portion, VII bisetose apically in male, 6-setose in female. Male genitalia (Figure 3C, D): The median lobe of aedeagus quite large, distinctly arcuate near base; base large, about 1/3 as long as the median lobe; the apical half nearly straight, slightly narrowed towards apex, which is blunt and slightly bent at tip; endophallus armed with a large and long copulatory piece which is about 3/8 as long as the median lobe; in dorsal view the apical lobe much wider than long, broadly rounded at apex; parameres less developed, much shorter than the median lobe, each bearing three long setae at apex. Etymology. Dedicated to Ms. Zijun Ma, a member of SCAU caving team, who is one of the collectors of the type series. Distribution. China (Hubei: Xianning). Known only from the cave Feixian Dong (Figure 4). Located in Huaping Shan, Tingsi, southern Xianning City, Feixian Dong is 1.5 km long. This obsolete show cave retains natural conditions in some parts along the main passage which are suitable for cave animals (Figure 4A–C). The beetles were collected from several sites inside the cave, on the ground or under stones, from 160 to 800 m from the entrance (Figure 4F). Other animals observed in Feixian Dong were bats, millipedes of Eutrichodesmus sp. and Skleroprotopus sp. (Figure 4D, E, G)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 6-10, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400

Dongodytes (s. str.) mingruoae n. sp. Figures 1j, 27B, 29–31 Material. Holotype: male, Cave I, Jiudu Xiang, Du’an Yao Autonomous County, Hechi Shi, Guangxi Zhuang Autonomous Region, southern China, 24.27°N / 108.23°E, 333 m in altitude, 2018-IX-25, leg. Mingyi Tian, Sunbin Huang & Mengzhen Chen, in SCAU; paratypes: 6 males and 8 females, same data as holotype, in SCAU; 2 male and 1 female, same cave, 2015-VII-27, leg. Xinhui Wang, Mingruo Tang & Jujian Chen leg., in SCAU; 1 male and 1 female, 2017-III-17, leg. Sunbin Huang, Pingjing Yang & Dianmei Wang, in SCAU. Diagnosis. Large sized cavernicolous trechines, not pubescent, head and pronotum with a few sparse setae, elytra glabrous, antennae very long, with the apical part (9 th to 11 th antennomeres) extended over the apex of elytra. Description. Length: 8.1–8.6 mm; width: 1.89–2.13 mm. Habitus as in Figure 29. Brown or light yellowish brown, apical half of antennae, mouthparts palps and tarsi pale. Underside of head, pro- and mesothorax covered sparsely with rather long setae; ventrites densely pubescent. Microsculpture: transverse striate on head and pronotum, dense isodiametric engraved meshes on elytra. Moderately shiny. Fore body including mandibles as long as elytra. Head elongate, much longer than wide, HLm/HW=3.22–3.47, HLl/HW= 2.54–2.68; widest at about frontal 1/3 of head excluding mandibles, much longer than pronotum, HLl/PnL = 1.48–1.65; genae hardly expanded, gradually narrowed posteriad, but strongly narrowed from basal 1/3, neck constriction fairly long, about 1/3 as wide as head; frons flat, vertex convex; clypeus transverse, 6-setose; labrum moderately sinuate at frontal margin, 6-setose; two pairs of supraorbital setae present, the anterior two at about the widest point, while the posterior two much shorter, only slightly longer than the secondary setae and so not easy to be noticed, at about 3/8 of head from base; a pair of suborbital setae present at about 1/4 from base; mentum and submentum well separated by a clear labial suture, mentum bisetose, mental tooth small and short, simple at tip; submentum 9-setose; mouthparts palps very thin and slender, glabrous except 2 nd labial palpomere which is bisetose on inner margin; the 2 nd labial palpomere 1.4 times longer than 3 rd; the 3 rd maxillary palpomere 1.1 times longer than 4 th; ligula 6 or 8-setose; antennae filiform, very slender and long, apical three antennomeres extended at over elytral apices; pubescent from pedicel, scape stouter and shorter than other, with several long setae; the 4 th the longest; the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.23) / 3 rd (2.51) / 4 th (2.60) / 5 th (1.70) / 6 th (1.97) / 7 th (1.77) / 8 th (1.49) / 9 th (1.23) / 10 th (1.11) / 11 th (1.23). Prothorax elongate, propleura strongly expanded and visible from above except base and front, longer than wide, PrL/PrW =1.41–1.70; slightly wider than head, PrW/HW= 1.10–1.21; wider than pronotum, PrW/PnW = 1.27–1.34; widest at about 1/3 from base. Pronotum elongate, much longer than wide, PnL/PnW = 1.90–2.22; slightly narrower than head, PnW/HW= 0.85–0.89; widest at about basal 1/3, slightly sinuate just before hind angles which are bluntly rectangular, front angles obtuse; base distinctly wider than front, PbW/PfW= 1.23–1.35; both anterior and posterior latero-marginal setae present, located at about 4/7 from base and a little before hind angles respectively; posterior transversal impression well-marked. Scutellum large, in inverse triangle, nearly as long as wide. Elytra very elongate, much longer than wide, EL/EW=2.05–2.24, much wider than prothorax; apex wider than base; lateral margins finely bordered, smooth and glabrous throughout; base slightly narrower than base of pronotum, humeral parts nearly straight, humeral angles widely rounded off; widest at about 2/3 from base; disc moderately convex except the basal area which is evidently depressed; striae indistinct, only the 1 st and 2 nd faintly traceable; chaetotaxy (Figure 27B): two dorsal pores present on the site of the 3 rd stria, at about basal 2/7 and 4/7 respectively; preapical pore present at apical 1/7 of elytron, pattern of the marginal umbilicate pores similar in D. (s. str.) baxian Tian, 2011. Legs thin and very slender, tibiae not longitudinally sulcate; the 1 st tarsomere subequal to 2 nd – 4 th tarsomeres combined in fore leg, while slightly longer those in middle and hind legs. Ventrite IV–VII each quadrisetose in both sexes. Male genitalia (Figure 30): Median lobe of aedeagus moderately elongate, nearly straight ventrally in apical half though shortly sinuate just before apex, which is blunt; basal orifice large, with a very small sagittal aileron; inner sac armed with a large copulatory piece which covered with scale structures on surface, as long as 1/4 of the median lobe; in dorsal, apical lobe short and narrow, rounded at apex; parameres very elongate and clavoid, evenly developed, each with 5 long and one or two short setae at apical portion. Remarks. Similar to Dongodytes (s. str.) baxian (Tian, 2010), but easily separated from the latter by its thinner head with longer and narrower neck constriction, the median lobe of aedeagus thinner, and narrower at apical part, and ventrite VII 4-setose in male, instead of bisetose. Etymology. Named after Ms. Mingruo Tang, a member of SCAU caving team. Distribution. Guangxi (Du’an). Known only from the Cave I in Jiudu Xiang (Figure 1j). Cave I opens on a hillside not far from a village. It is about 200 metres long, from the large opening to its bottom, through a steep slope. It is surrounded by big trees and dense bushes but sun light can reach most parts of the cave. There is a large population of Begonia edulis Lévl., 1909 (Figure 31A, B). There are droplets of water in some places at half way or near the bottom. The blind beetles were discovered lower half of the cave (Figure 31C). Apart from D. (s. str.) mingruoae n. sp., Dongodytes (Dongodytodes) sp. and Eutrichodemus millipede species also occur in this limestone cave.

Sinaphaenopoides n. gen. Type species: Sinaphaenopoides zhaoyiae n. sp. (Zhongguo Dong, Chenzhou, Hunan) Generic characteristics. Medium-sized for cave trechines; aphaenopsian, more or less similar to Sinaphaenops Uéno & Wang, 1991; body moderately elongate, fore body as long as elytra; head covered with sparse setae, pronotum and elytra glabrous, but head with a few sparse setae on genae. Head much longer than wide, side tumid, neck short, constriction short; presence of three pairs of supraorbital setiferous pores; frontal furrows short, ended before middle of head; frons flat, vertex strongly convex; clypeus 6-setose; right mandibular tooth bidentate; mentum and submentum fused; mentum bisetose, base largely concave; tooth simple at apex; submentum with a row of 8 or 9 setae; 2 nd labial palp bisetose on inner margin; antennae thin and long, extending to apical margins of elytra; scape longer than pedicel. Prothorax longer than wide, strongly tumid, making the propleura visible from above; pronotum longer than wide, with two pairs of latero-marginal setae, hind angle forwardly shifted, sharp; disc moderately convex, base as long as front. Elytra elongated ovate, widest at about apical 2/5; humeral angles completely rounded; lateral margins smooth and glabrous throughout; disc strongly convex, striae obsolete though more or less traceable, intervals slightly convex; apical striole absent; presence of two dorsal and the preapical pores; only 2 nd marginal umbilicate pore near marginal gutter; humeral set not aggregated, 1 st pore inwardly and backwardly shifted, median set moderately separated each other. Fore tibiae not sulcate longitudinally. Remarks. Sinaphaenopoides n. gen. is similar to the genus Sinaphaenops Uéno & Wang, 1991 ranged in Guizhou and northern most Guangxi, in body shape as well as in the chaetotaxy. But there is a large geographical gap between them. For example, the cave Zhongguo Dong, the locality of Sinaphaenopoides, is about 500 km from the cave Laji Dong in Libo Xian, southeastern Guizhou, which is a locality of S. wangorum Uéno & Ran, 1998, the eastern most for a Sinaphaenops species (Uéno & Wang 1991, Uéno & Ran 1998, Chen et al. 2017). However, Sinaphaenopoides n. gen. harbours several different characteristics of generic importance from Sinaphaenops apart from less elongate and thinner legs and antennae, such as: (1) head with three pairs of frontal setiferous pores in Sinaphaenopoides n. gen., vs. only one or two pair(s) of frontal setiferous pores in Sinaphaenops; (2) scape of antennae longer than pedicel in Sinaphaenopoides n. gen. vs. shorter in Sinaphaenops; and (3) elytra moderately convex in Sinaphaenopoides n. gen., with striae more or less traceable, vs. elytra strongly convex and striae completely disappeared in Sinaphaenops. Probably, Sinaphaenopoides n. gen. is relative to the subgenus Dongaphaenops Deuve & Tian, 2014 within Sinaphaenops because they share the following characteristics: (1) Head sparsely setose, with shorter antennae which extending only at elytra apices; (2) mentum and submentum fused; and (3) pronotum with two pairs of latero-marginal pores. Phylogenetic analysis based on molecular data hinted that Dongaphaenops would be an independent lineage. Etymology. Refers to the similarities between the new genus and Sinaphaenops. Gender masculine. Range. China (Hunan) (Figure 1m)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 20-21, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Ueno, S. I. & Wang, F. X. (1991) Discovery of a highly specialized cave trechine (Coleoptera, Trechinae) in Southeast China. Elytra, 19, 127 - 135.","Ueno, S. I. & Ran, J. C. (1998) Notes on Sinaphaenops (Coleoptera, Trechinae), with descriptions of two new species. Elytra, 26, 51 - 59.","Chen, J. J., Tang, M. R., Yang, P. J. & Tian, M. Y. (2017) Contribution to the knowledge of the aphaenopsian genus Sinaphaenops Ueno et Wang, 1991 (Coleoptera: Carabidae: Trechini). Zootaxa, 4227 (1), 106 - 118. https: // doi. org / 10.11646 / zootaxa. 4227.1.6","Deuve, T. & Queinnec, E. (2014) Deux nouveaux Trechini de la Chine du Sud-Ouest (Coleoptera, Caraboidea, Trechinae). Bulletin de la Societe entomologique de France, 119, 467 - 471. https: // doi. org / 10.3406 / bsef. 2014.2427"]}

Youtrechus n. gen. Type species: Youtrechus zijunae n. sp. (Feixian Dong, Xianning, Hubei) Generic characteristics. Medium-sized for cave trechines, semi-aphaenopsian body moderately elongate, surface glabrous. Head stout, slightly longer than wide, sides slightly expanded; neck narrow, constriction well-marked; presence of two pairs of supraorbital setiferous pores; frontal furrows well-marked, not parallel-sided, slightly divergent at base, strongly contracted medially, and widely divergent posteriorly; frons rather flat, vertex convex; right mandibular tooth tridentate, though median one more or less reduced; mentum and submentum separated by labial suture, mentum bisetose, base largely concave, tooth short, widened and blunt at apex; submentum with a row of 6 setae; antennae fairly long, extending at about apical 1/5 and 1/4 of elytra in male and female respectively. Prothorax not tumid, propleura invisible from above; pronotum quadrate, as long as head excluding mandibles, widest at about 1/3 from front, hind angles nearly rectangular, pointed; base emarginate; presence of two pairs of latero-marginal setae; disc slightly convex. Elytra elongated ovate, longer than head plus pronotum, widest at about middle, humeral angles completely rounded; lateral margins smooth and glabrous throughout; disc strongly convex, striae fine and deep, intervals convex; presence of three dorsal and one preapical pores; humeral set of the marginal umbilicate pores not aggregated. 1 st and 2 nd protarsomeres widened and protruded inwardly at apex in male; tibiae longitudinally sulcated. Ventrites smooth, IV– VI each with two pairs of paramedial setae, together with several pubescence in middle portion, VII bisetose apically in male, 6-setose in female. Male genitalia: aedeagus wellsclerotized, moderately elongated, strongly arcuate near base; base large and wide, apical lobe broad in frontal view, slightly bent at tip in lateral view. Parameres thin and small, each with three long setae at apex. Etymology. “You” + Trechus, “You” means dark in Chinese, referring to the trechine beetles living in subterranean habitat. Gender masculine. Remarks. Youtrechus is the unique cavernicolous genus of the tribe Trechini known so far from southeastern Hubei Province. It has no evident relative because the locality (cave Feixian Dong) is very far from those of other cave trechine beetles. For instance, the closest cave is Shuilian Dong in northwestern Jiangxi Province (the locality of Luoxiaotrechus Tian & Yin, 2013), which is 260 km in linear distance from Feixian Dong. However, the combined generic characters of Youtrechus such as body shape, tridentate right mandibular tooth, modified protarsomeres 1 and 2 in male, presence of labial suture and chaetotaxy patterns on head, pronotum and elytra indicate that this new genus is probably close to the genus Qianaphaenops Uéno, 2000 which is a diverse complex occurring in Guizhou, Chongqing and Shaanxi (Uéno 2000, Tian et al. 2018, Chen et al. 2019). Youtrechus may be related to some Japanese trechines (such as Epaphiopsis Uéno, 1953, Trechiama Jeannel, 1927 and so on) or to Trechiotes Jeannel, 1954 because the presence of a dorsal seta on the 5 th elytral interval, in a more posterior position than the two setae of the 3 rd stria which is a very important character. This new genus is easily recognized by its stout head with well-developed frontal furrows, quadrate pronotum with well-marked hind angles, elytra with three dorsal pores, and, in particular, the male genital organ which is remarkably enlarged and elongated at base and strongly arcuate near base. Range. China (Hubei) (Figure 1n)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 5-6, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Ueno, S. I. (2000) New cave trechines (Coleoptera, Trechinae) from northeastern Guizhou, South China. Journal of the Speleological Society of Japan, 25, 1 - 38.","Tian, M. Y., Huang, S. B. & Wang, D. M. (2018) Occurrence of hypogean trechine beetles in Hanzhong Tiankeng Cluster, southwestern Shaanxi, China (Coleoptera: Carabidae: Trechinae). Annales de la Societe entomologique de France, New Series, 54 (1), 81 - 87. https: // doi. org / 10.1080 / 00379271.2017.1417056","Chen, M., Ma, Z. J. & Tian, M. Y. (2019) Discovery of a cavernicolous trechine species from the Sanwang Dong-Erwang Dong cave system, Wulong, Chongqing, southwestern China (Coleoptera: Carabidae: Trechinae). Zootaxa, 4668 (1), 105 - 114. https: // doi. org / 10.11646 / zootaxa. 4668.1.6"]}

Wumengius n. gen. Type species: Wumengius fengi n. sp. (Da Dong, Duge, Liupanshui, Guizhou) Generic characteristics. Medium-sized for cave trechines;anophthalmic,body moderately elongate,surface glabrous though genae with sparse setae. Head slightly longer than wide, sides sub-parallel-sided; neck short, constriction well-marked; presence of two pairs of supraorbital setiferous pores; frontal furrows well-marked, strongly divergent anteriorly and posteriorly; frons and vertex convex; clypeus quadrisetose, labrum strongly bisinuate at margin; mandibles moderately developed, feebly curved apically, right mandibular tooth tridentate; mentum and submentum completely fused, mentum bisetose, base largely concave, each side with a long setae; tooth moderately long, rather widened and faintly bifid at tip; submentum with a row of 9 setae; 2 nd labial palp with only a seta on inner margin; antennae short, extending only at about apical 3/5 of elytra. Prothorax not tumid, propleura invisible from above; pronotum subcordate, as long as head including mandibles, widest at about 5/7 from base, fore angles protruding, hind angles nearly rectangular, pointed; base nearly straight; presence of only the anterior pair of latero-marginal setae; disc moderately convex. Elytra elongated ovate, longer than head plus pronotum, widest at about middle, humeral angles completely rounded off; lateral margins sub-serrate near base, ciliate throughout; disc strongly convex, striae fine and deep, intervals slightly convex; apical striole absent; presence of two dorsal and the preapical pores; 1 st, 2 nd and 6 th marginal umbilicate pores near marginal gutter; humeral set aggregated, median set close to each other. Protarsomeres not modified in male; tibiae longitudinally sulcate. Male genitalia weakly sclerotized, thin and elongated, slightly arcuate medially; base small and narrow, with a large sagittal aileron, apical lobe slightly reflexed; parameres moderately developed, much shorter than the median lobe. Remarks. Wumengius n. gen. is a peculiar genus regarding its non-dilated protarsi in male, basal foveae of mentum with a pair of setae, the 2 nd labial palp unisetose on inner margin and labrum deeply bisinuate at frontal margin. The well-defined frontal furrows and elytral chaetotaxal pattern indicate that it is an anophthalmic type species. It differs from Guizhaphaenops (Vigna Taglianti 1997, Uéno 2000), a semi-aphaenopsian genus ranging in northwestern Guizhou and northeastern Yunnan, by the completefrontal furrows (vs partially reduced in Guizhaphaenops), subcordate pronotum (vs round-ovate in Guizhaphaenops), and aggregated humeral set of the marginal umbilicate pores (not aggregated in Guizhaphaenops). Wumengius n. gen. is different from Dongoblemus Deuve & Tian 2016, distributed in Kema Dong of Zhenxiong which is not far from Da Dong, by: (1) maxillary palp 3 glabrous, vs. with several setae in Dongoblemus; (2) each side of basal fovea of mentum with a seta, vs. no basal foveal seta in Dongoblemus; (3) Mandibular tooth tridentate, vs. bidentate in Dongoblemus; (4) pronotum without hind latero-marginal pores, which are present in Dongoblemus; and dorsal pores of elytra on stria 3, vs. on stria 4 in Dongoblemus. Etymology. Refers to the Mts. Wumeng which ranges in western Yunnan and northwestern Guizhou province. Gender masculine. Range. China (Guizhou)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 10-11, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Ueno, S. I. (2000) New cave trechines (Coleoptera, Trechinae) from northeastern Guizhou, South China. Journal of the Speleological Society of Japan, 25, 1 - 38.","Deuve, T. & Tian, M. Y. (2016) Descriptions de sept nouveaux Trechini cavernicoles de la Chine continentale (Coleoptera, Caraboidea). Bulletin de la Societe entomologique de France, 121 (3), 343 - 354. https: // doi. org / 10.3406 / bsef. 2016.2174"]}

Chenotrechus n. gen. Type species: Chenotrechus parvulus n. sp. (Xiniuyan, Laibin, Guangxi) Generic characteristics. Small-sized for cave trechines; body short and less elongate, fore body shorter than elytra; surface glabrous, but head with a few sparse setae on genae. Head elongated quadrate, sub-parallel-sided; neck short, constriction well-marked; presence of two pairs of supraorbital setiferous pores; frontal furrows well-marked but incomplete, sub-parallel-sided medially, slightly and moderately divergent forwardly and posteriorly respectively; frons slightly, and vertex strongly convex; clypeus quadrisetose, labrum widely emarginate at frontal margin; right mandibular tooth tridentate; mentum and submentum partially fused due to labial suture invisible medially; mentum bisetose, base largely concave; tooth short and blunt, unifid at apex; submentum with a row of 7 setae; 2 nd labial palp bisetose on inner margin; antennae thin and long, extending to apical margins of elytra. Prothorax moderately tumid, propleura visible from above; pronotum subquadrate, shorter than head excluding mandibles, lateral margins evidently bisinuate before hind angles; presence of two pairs of latero-marginal setae; disc moderately convex, base narrower than front. Elytra elongated ovate, apex much wider than base, widest at about apical 1/3; humeral angles completely rounded off; lateral margins ciliate throughout; disc strongly convex, striae obsolete and not traceable; apical striole absent; presence of two dorsal and a preapical pores; only 2 nd marginal umbilicate pore near marginal gutter; humeral set not aggregated, median set close to each other. Protarsomeres not modified in male; tibiae not sulcate longitudinally. Male genitalia weakly-sclerotized, short and moderately elongated, hardly arcuate medially; base quite large, with a rather small sagittal aileron which is almost translucent, apical lobe straight, broadly blunt at apex, longer than wide in dorsal view; parameres moderately developed, much shorter than the median lobe. Remarks. Chenotrechus n. gen. is the first cave-adapted trechine lineage reported from central part of Guangxi Zhuang Autonomous Region. There is a wide geographical gap from other cave trechine beetles known in Guangxi, e.g., over 150 km from Du’an Karst, a kingdom of the genus Dongodytes Deuve, 1993 (where occur also Xuedytes Tian & Huang, 2017, Libotrechus Uéno, 1998 and Uenotrechus Deuve & Tian, 1999) (Tian et al. 2014, 2017, Lin & Tian 2014, Wei et al. 2017), and 180 km from the cave Chaotianyan in Pingle Karst, the locality of Oodinotrechus (Pingleotrechus) yinae Sun & Tian, 2015 (Sun & Tian 2015). Chenotrechus is not related to any of the abovementioned genera. The characteristics combined, such as: fore body distinctly shorter than elytra, incomplete frontal furrows, small and short prothorax with tumid propleura, elytra widened posteriorly, nonaggregated humeral group of the marginal umbilicate pores which are distant from marginal gutter, vanished striae and apical striole, and protarsomeres not modified in male indicate for Chenotrechus a peculiar position among Chinese cave trechine fauna. Etymology. “Chen” + “ Trechus ”. Dedicated to the late Prof. Shoujian Chen (SCAU), one of the pioneers of Carabidology in China. Range. China (Guangxi) (Figure 1k)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on page 15, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Deuve, T. (1993) Description de Dongodytes fowleri n. gen., n. sp., Coleoptere troglobie des karsts du Guangxi, Chine (Adephaga, Trechidae). Bulletin de la Societe entomologique de France, 98, 291 - 296. https: // doi. org / 10.3406 / bsef. 1993.17898","Tian, M. Y., Huang, S. B. & Wang, D. M. (2017) Discovery of a most remarkable cave-specialized trechine beetle from southern China (Coleoptera: Carabidae: Trechinae). ZooKeys, 725, 37 - 47. https: // doi. org / 10.3897 / zookeys. 725.21040","Ueno, S. I. & Ran, J. C. (1998) Notes on Sinaphaenops (Coleoptera, Trechinae), with descriptions of two new species. Elytra, 26, 51 - 59.","Deuve, T., Tian, M. Y. & Ran, J. C. (1999) Trois Caraboidea remarquables de la reserve nationale de Maolan, dans le Guizhou meridional, Chine (Coleoptera, Carabidae et Trechidae). Revue francaise d'Entomologie, New Series, 21, 131 - 138.","Tian, M. Y., Yin, H. M. & Huang, S. B. (2014) Du'an Karst of Guangxi: a kingdom of the cavernicolous genus Dongodytes Deuve (Coleoptera: Carabidae: Trechinae). ZooKeys, 454, 69 - 107. https: // doi. org / 10.3897 / zookeys. 454.7269","Lin, W. & Tian, MY. (2014) Supplemental notes on the genus Libotrechus Ueno, with description of a new species from Guangxi, southern China (Coleoptera: Carabidae: Trechinae). The Coleopterists Bulletin, 68 (3), 429 - 433. https: // doi. org / 10.1649 / 072.068.0314","Wei, G. F., Chen, J. J. & Tian, M. Y. (2017) A review of the aphaenopsian ground beetle genus Uenotrechus Deuve et Tian, 1999 (Coleoptera: Carabidae: Trechinae). Zootaxa, 4282 (2), 361 - 373. https: // doi. org / 10.11646 / zootaxa. 4282.2.9","Sun, F. F. & Tian, M. Y. (2015) First cavernicolous trechine beetle discovered in Guilin karst, northeastern Guangxi (Coleoptera, Carabidae, Trechinae). ZooKeys, 545, 119 - 129. https: // doi. org / 10.3897 / zookeys. 545.6111"]}

Shilinotrechus zhangfani n. sp. Figures 1a, 35−37 Material. Holotype male, cave Xianren Dong, Xi’er Township, Mile Shi, Honghe Hani &Yi Autonomous Prefecture, Yunnan Province, 103.20 E, 24.48 N, 1901 m above sea level, 2020-VIII-17, Mingyi Tian & Jingli Cheng leg., in SCAU. Diagnosis. Small-sized and stout trechine species, eyeless and depigmented, body concolourous brown. Description. Length: 4.9 mm; width: 1.8 mm. Habitus as in Figure 35. Body stout and strongly convex on dorsum; concolourous brown, but antennae, palps and tarsi slightly lighter; surface with fine and sparse pubescence; microsculpture engraved meshes irregularly isodiametric or polygonal on head, pronotum and elytra. For body much shorter than elytra, (HLm+PL) / EL = 0.71. Head slightly longer than wide, HLm/HW = 1.67, HLl/HW = 1.22; widest at about middle excluding mandibles, frontal furrows widened, nearly parallel-sided; two pairs of supraorbital pores present; clypeus 4-setose; labrum distinctly emarginate, 6-setose; right mandibular tridentate; mentum and submentum separated; mentum bisetose, base bi-foveate, tooth thick and short, bluntly bifid at tip; submentum sharply spined medially, 6-setose; mouthparts palps very thin and elongated; apical one in maxillae widened at base, narrowed towards apex, reverse in penultimate one; apical one in labium similar to that in maxillae, while penultimate one gently narrowed towards base; the 2 nd labial palpomere bisetose on inner margin, with three additional setae near apical portion, the 3 rd maxillary palpomere with four short set ae on apical half, other palps smooth and glabrous; the 2 nd labial palpomere 1.2 times longer than 3 rd; the 3 rd maxillary palpomere as long as 4 th; suborbital pores present. Antennae filiform, extending to 1/3 of elytra from base; scape stout, with several setae, as long as pedicel; pedicel to 11 th antennomeres pubescent; the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1,00) / 2 nd (1.00) / 3 rd (1.36) / 4 th (1.41) / 5 th (1.41) / 6 th (1.41) / 7 th (1.27) / 8 th (1.09) / 9 th (1.09) / 10 th (1.00) / 11 th (1.23). Pronotum subtrapezoidal, wider than head, PW/HW = 1.33, clearly wider than long, PW/PL = 1.26; lateral margins finely bordered, widely and upwardly reflexed throughout, more so near base; hind angles obtuse, fore angles protruding; base much wider than front, PbW/PfW = 1.42; base shallowly bisinuate, slightly convex backwardly in median portion, front straight; two marginal setae present, the anterior located at about 1/6 from front, and a little after the front angles, the posterior at hind angle. Scutellum very small. Elytra elongate, amygdaloidal, base more widened than apices; longer than wide, EL/EW = 1.53, much wider than pronotum, EW/PW = 1.72, more than two times longer than pronotum, EL/PL = 3.26, widest at about 1/4 from base; shoulders broadly protruding, lateral margins ciliate throughout; striae deep, the 8 th stria invisible; apical recurrent striole short; chaetotaxy (Figure 36A): basal pore present; two dorsal setiferous pores present along stria 3 before and behind middle of elytra respectively; the preapical dorsal pore present, located in the anastomosis of 3 rd and 4 th striae, closer to elytral suture; the humeral group of marginal umbilicate pores not aggregated, 1 st pore forwardly shifted; 1 st and 2 nd pores close to the marginal gutter; middle group (5 th and 6 th pores) locate before middle of elytra, not very close to each other; the anguloapical pore absent. Legs slender, protibiae without longitudinal sulcus.the 1 st tarsomere much shorter than 2 nd –4 th tarsomeres together in fore leg, whereas as long as and longer than those in middle and hind legs respectively. The 1 st protarsomere enlarged and widened, not denticulate inwardly at apex in male. Underside smooth and mostly glabrous in head and thorax; abdominal ventrites shortly and sparsely pubescent sparsely setose; IV−VI each with two paramedial setae; VII bisetose in male. Male genitalia (Figure 36B, C): The median lobe of aedeagus very short and stout, moderately sclerotised, basal portion strongly bent ventrally; apical part nearly straight, parallel-sided until apex, which suddenly contracted and widely broad; in dorsal view, apical lobe gradually widened toward apex, which is broadly rounded, copulatory piece extending over apex; basal orifice small, with a small sagittal aileron; copulatory piece large and long, about 2/7 as long as the median lobe; parameres thin and elongated, slightly shorter than the median lobe, each bearing with three long setae at apex. Female: Unknown. Remarks. It is the fourth species of the Yunnan’s endemic genus Shilinotrechus Uéno, 2003. It differs from other congeners by thinner body, shoulders of elytra strongly protruded, the 1 st marginal umbilicate pore evidently shifted forwardly, and in particular the strongly bent male genitalia (Uéno 2003, Huang & Tian 2015, Huang et al. 2020b). Etymology. This new species is named in honour of Mr. Fan Zhang (Institute of Geology, Yunnan University, Kunming), who is a leading caver in Yunnan Province. Distribution. China (Yunnan).Known only from the limestone cave called Xianren Dong in Mile Shi (Figure 1a). Xianren Dong is located on the left side of Road X016 about 7 kilometres from Xi’er Town. The length remains unknown, with a small entrance. Inside the cave, the humidity was rather high. Bats, two species of millipedes and growing mould were also observed inside the cave in addition to the unique trechine beetle, which was discovered under a stone in the inner most part of the main passage (Figure 37). Genus Guizhaphaenops Vigna Taglianti, 1997, Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 54-57, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Ueno, S. I. (2003) A new genus and species of extraordinary cave trechine (Coleoptera, Trechinae) from eastern Yunnan, Southwest China. Elytra, 31, 245 - 252.","Huang, S. B. & Tian, M. Y. (2015) New species and new record of subterranean trechine beetles (Coleoptera: Carabidae: Trechinae) from southwestern China. The Coleopterists Bulletin, 49 (4), 727 - 733. https: // doi. org / 10.1649 / 0010 - 065 X- 69.4.727","Huang, S. B., Tian, M. Y. & Faille, A. (2020 b) Two new species of subterranean ground beetles from China (Coleoptera: Carabidae: Trechinae). Raffles Bulletin of Zoology, Supplement No. 35, 22 - 31."]}

Graciliblemus gui n. sp. Figures 1m, 41–42 Material. Holotype male, Gui Dong (Ghost Cave), Pilin, Zhaoxing, Liping, Guizhou, 2020-VI- 22, 305 m, Mingyi Tian leg., in SCAU; paratype: 1 female, idem, in SCAU. Diagnosis. Very small and slender trechine beetle, wholly pubescent, anophthalmic, depigmented, fore body much shorter than elytra. Description. Length: 3.1–3.8 mm; width: 0.9–1.0 mm. Habitus as in Figure 41A. Head with antennae brown, pronotum and elytra yellow, mouthparts, palps and tarsi pale; head slightly shiny, pronotum and elytra dim. Microsculptural engraved meshes indistinct. Head and pronotum smooth, whole elytral covered with coarse and irregular punctures. Head stout though longer than wide excluding mandibles, HLl/HW = 1.0–1.04, HLm/HW = 1.42–1.44, frons rather flat, vertex convex, with longer pubescence; genae broadly expanded, with shorter pubescence; frontal furrows entire, nearly parallel-sided but strongly divergent posteriorly; both anterior and posterior supraorbital pores closely located, the anterior at about middle excluding mandibles, the posterior just before neck constriction which is well marked; clypeus transverse, 4-setose, labrum transverse, frontal margin distinctly bisinuate, making median part bluntly protruding, 6-setose; mandibles rather short, strongly curved apically; right mandibular tooth bidentate; labial suture invisible; mentum bisetose, tooth thin and simple, base largely concaved; submentum 6- setose, with setae very long; 2 nd labial and 3 rd maxillary palps strongly tumid, 3 rd labial and 4 th maxillary palps thin; 2 nd labial palp bisetose, with an additional seta near apex on outer margin; penultimate palp slightly longer than the apical ones in both labium and maxillae; antennae filiform, short and stout, extending at about basal 2/3 of elytra; scape stouter and smooth, with several long setae, slightly longer than pedicel which is the shortest; the 11 th the longest; pubescent from pedicel to 11 th antennomere; the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.16) / 2 nd (1.00) / 3 rd (1.20) / 4 th (1.34) / 5 th (1.32) / 6 th (1.28) / 7 th (1.24) / 8 th (1.04) / 9 th (1.16) / 10 th (1.08) / 11 th (1.52). Propleura invisible from above; pronotum subcordate, slightly transverse, PnL/PnW = 0.88–0.91, wider than head, PnW/HW = 1.32–1.39, slightly longer than head excluding mandibles, HLl/PnL = 1.02–1.10, HLm/PnL = 1.36–1.44; widest a little before middle, lateral margins finely bordered, strongly sinuate before hind angles which are acute, fore angles broadly obtuse, slightly protruded forwardly; two pairs of latero-marginal setae present, the anterior located at before middle, the posterior a little before hind angle; base almost straight in most part, but shortly oblique forwardly near hind angle on both sides; front nearly straight; median line fine and well-defined; posterior transversal impression faint. Scutellum moderately sized. Elytra oblongus, elongate and slender, moderately convex; much longer than head plus pronotum,EL/(HLm+PnL) = 1.28–1.35; much longer than wide, EL/EW = 1.86–1.93, wider than pronotum, EW/PnW = 1.40–1.44; base unbordered, shoulders rounded, without humeral angle; lateral margins gently expanded, widest at about middle of elytra, sub-serrate and ciliate throughout; disc coarsely and irregularly punctate, striae rather deep, intervals slightly convex; apical striole present in the continuation of stria 6; chaetotaxy (Figure 41B): basal pore present; both dorsal pores located along 5 th stria, at about basal 1/5 and a little behind the middle of elytra, respectively, preapical pore located at apical fusion of 2 nd and 3 rd striae, much closer to suture than to apical margin of elytra; marginal umbilicate series with 1 st, 2 nd and anguloapical pore close to the marginal gutter; humeral group equidistantly spaced, while both 5 th and 6 th pores widely separated. Legs covered with dense and short hairs; tibiae without longitudinal sulcus; the 1 st tarsomere shorter than 2 nd- 4 th combined in fore leg, while as long as 2 nd- 4 th combined in middle and hind legs. In male, the 1 st and 2 nd protarsomeres feebly more widened, both distinctly denticulate inwardly at apex. Abdominal ventrites pubescent, ventrites IV–VI each with a pair of paramedial setae; VII bisetose in male, while quadrisetose in female. Male genitalia (Figure 41C, D): Weakly sclerotized, very small but elongate, evidently arcuate medially, base large, with a small sagittal aileron; apical dorsal membranous open fairly wide, inner sac without distinct copulatory piece, apical lobe evenly narrowed, blunt at apex in lateral view; in dorsal view, apical lobe wide, gradually narrowed toward the broad apex; both parameres fairly developed, slightly curved, right one with 4, while the left with 3 long setae at apex respectively. Remarks. This is the second species of the genus Graciliblemus, differing from the type species G. lipingensis Deuve & Tian, 2016 by its larger body size, pronotum with lateral margins strongly sinuate before hind angles, and elytra more elongate (Deuve & Tian 2016). Etymology. “Gui” means ghost in Chinese. It refers to the type locality, Gui Dong Cave. Distribution. China (Guizhou). Known only from the limestone cave Gui Dong in southern Liping County, Qiandongnan Miao & Dong Autonomous Prefecture, eastern Guizhou Province (Figure 1m). Gui Dong is near Pilin Village, and opens just along a road. There is a monument near the entrance. It is a short cave, about 30 metres long, connecting to an underground creek in the inner most part. As it was muddy and wet, moulds and mushrooms were growing inside. Apart from the trechine beetles, cave crickets also occur in Gui Dong (Figure 42). Additional generic characteristics of Graciliblemus Deuve & Tian, 2016. Ventrite VII bisetose in male, while quadrisetose in female; the 1 st and 2 nd protarsomeres modified in male., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 61-64, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Deuve, T. & Tian, M. Y. (2016) Descriptions de sept nouveaux Trechini cavernicoles de la Chine continentale (Coleoptera, Caraboidea). Bulletin de la Societe entomologique de France, 121 (3), 343 - 354. https: // doi. org / 10.3406 / bsef. 2016.2174"]}

Dongodytes (Dongodytodes) pingjingae sp. n. Figures 1i, 26, 27B, 28 Material. Holotype male, Xiannü Dong, Guhe, Dahua Yao Autonomous County, Hechi Shi, Guangxi Zhuang Autonomous Region, 23.90 N, 107.74° E, 240 m, VII. 9. 2016, Mingyi Tian, Pingjing Yang, Mingruo Tang & Jingli Cheng leg., in SCAU. Paratypes: 3 males and 9 females, IBID, in SCAU. Diagnosis. Medium-sized for Dongodytodes species, whole surface pubescent, head hardly expanded, fore part (head including mandibles plus prothorax) slightly longer than elytra. Description. Length: 7.7–7.9 mm; width: 1.8–1.9 mm. Habitus as in Figure 26. Brown, but antennae, mouthparts palps and tarsi pale. Microsculptural engraved meshes moderately or transverse on head, strongly transverse on pronotum, invisible on elytra. Body wholly pubescent, sparser on head and pronotum, denser on elytra; underside of head and thorax sparsely covered with longer hairs; ventrites densely and shortly pubescent, propleura glabrous but with a few short setae anteriorly. Head and pronotum smooth, elytra vaguely punctate. Moderately shiny. Head elongate, much longer than wide, HLm/HW=3.0–3.1; widest at about 1/3 excluding mandibles, as long as pronotum excluding mandibles; genae hardly expanded, gradually narrowed toward base, suddenly constricted before the collar-shaped neck which is about 2/5 as wide as head; frons flat, vertex convex; clypeus transverse, 6-setose; labrum nearly straight at frontal margin, 6-setose; two pairs of supraorbital setae present, anterior and posterior ones at about 1/3 and 7/9 from labrum to neck constriction respectively; a pair of suborbital setae present, mentum and submentum well separated by a clear labial suture, mentum with two pairs of setae, at base of tooth and sides of basal concave respectively; mental tooth short and bluntly bifid at apex; submentum 12- to 14-setose; mouthparts palps glabrous except 2 nd labial palpomere bisetose on inner margin; 2 nd labial palpomere 1.4 times longer than 3 rd, 3 rd maxillary palpomere 1.1 times longer than 4 th; ligula 10-setose; two pairs of suborbital pores present; antennae filiform, slender long, extending at about apical 1/7 of elytra; 1 st antennomere much more dilated than others, slightly longer than 2 nd which is shortest; the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.05) / 2 nd (1.00) / 3 rd (2.47) / 4 th (2.37) / 5 th (2.37) / 6 th (2.32) / 7 th (2.00) / 8 th (1.58) / 9 th (1.58) / 10 th (1.26) / 11 th (1.53). Prothorax long, propleura moderately tumid, and well visible from above, slightly wider than head, PrW/HW = 1.12–1.18; distinctly wider than pronotum, PrW/PnW = 0.76–0.85 (mean 0.81); widest at about 1/3 from base. Pronotum elongate, much longer than wide, PrL/PrW =1.88–1.94; slightly narrower than head, PnW/HW= 0.87– 0.92; sub-parallel-sided in most parts, slightly sinuate just before hind angles; front distinctly narrower than base, PfW/PbW =0.69–0.77; front angles bluntly right, hind angles roundly obtuse; two pairs of latero-marginal setae present, located at about 4/7 from base and a little before hind angles respectively; posterior transversal impression well-marked. Scutellum quite large, inverse triangle. Elytra elongate, long than wide, EL/EW= 2.05–2.13; much wider than prothorax, EW/PrW=1.87–2.10; slightly shorter than head including mandibles and pronotum combined, EL/(HLm+PnL) = 0.94–1.00; base rather narrow, lateral margins smooth and glabrous, widest at about apical 4/7 of elytra; disc strongly convex though rather flat near base; striae not traceable; chaetotaxy (Figure 27A): only a dorsal pores present on the site of 3 rd stria, at about apical 4/7, preapical pore present, at about apical 1/8; humeral group of the marginal umbilicate pores not aggregated, 4 th backwardly shifted, closer to 5 th pore than to 3 rd; the anguloapical pore present. Legs thin and slender, tibiae not longitudinally sulcate; the 1 st tarsomere slightly shorter, slightly longer and as long as 2 nd – 4 th tarsomeres combined in fore, middle and hind legs respectively. Ventrite VII bisetose in male, 4-setose in female. Male genitalia (Figure 28A, B): Male genitalia well-sclerotized, median lobe very elongate and thin, basal orifice comparatively small, but with a large sagittal aileron; base quite large, strongly curved ventrally in apical half, apical lobe roundly blunt; inner sac with a weakly-marked copulatory piece about 1/4 as long as median lobe; in dorsal view, apical lobe distinctly narrowed and nearly parallel-sided before the rounded apex; parameres slender, base much widened, apical part distinctly narrowed, each with four long setae apically. Remarks. This new species differs from other congeners of the subgenus Dongodytodes Tian, 2011 by having a well-defined labial suture. It may be close to D. (Dongodytodes) yaophilus (Tian et al. 2014) which is also recorded from Dahua County, and the localities (Xiannü Dong and Qiaoxu Dong) of both species are distant from only 20 kilometres in a straight line. However, the male genitalia is slenderer, with a more widened apical lobe, and parameres are narrowed at apices instead of broadly rounded in D. (D.) yaophilus. Etymology. This beautiful species is named after Ms. Pingjing Yang (a member of SCAU caving team), one of the collectors of the type material. Distribution. China (Guangxi). Known only from the type locality, cave Xiannü Dong (Figure 1i). Xiannü Dong is a disused limestone show cave, about 2 kilometres long. There are several chambers along the main passage. Apart from the cave beetles, crickets, millipedes, woodlice, snails and a white mouse were also observed inside the cave. The beetles were wandering on walls and on the ground in several wet places in the dark zone (Figure 28C)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 41-45, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Tian, M. Y., Yin, H. M. & Huang, S. B. (2014) Du'an Karst of Guangxi: a kingdom of the cavernicolous genus Dongodytes Deuve (Coleoptera: Carabidae: Trechinae). ZooKeys, 454, 69 - 107. https: // doi. org / 10.3897 / zookeys. 454.7269"]}

Wumengius fengi n. sp. Figures 1d, 5–7 Material. Holotype male, 26.31 °N / 104.70 °E, 1435 m, the cave Da Dong near village Tuoluo, Hongguang, Duge, Liupanshui, Guizhou, 2019. VII. 6, Zegang Feng & Chen Zhang leg., in SCAU. Diagnosis. Anophthalmic, medium-sized cave beetle, with moderately elongated body and appendages, eyeless and depigmented; fore part (head plus prothorax) evidently shorter than elytra, surface glabrous. Description. Length: 6.0 mm; width: 2.0 mm. Habitus as in Figure 5. Body yellowish brown, but mouthparts palps and tarsi pale; moderately shiny and whole body glabrous though genae with a few setae and lateral margins of elytra covered with short setae; microsculptural engraved meshes more or less isodiametric on head, moderately transverse on pronotum and elytra; fore body much shorter than elytra, (HLm+PL) / EL = 0.71. Head stout, slightly longer than wide, HLm/HW = 1.52, HLl/HW = 1.1; genae not evidently expanded, widest at about 1/3 of head from neck to apical margin of labrum; frons and vertex convex; clypeus transverse, quadrisetose; labrum transverse, frontal margin strongly bisinuate, and so there is a prominent median lobe, 6-setose; anterior supraorbital setiferous pores located at about middle and the posterior ones near neck constriction; labial suture invisible, mentum with a seta on each side of tooth which is much shorter than lateral lobes, basal fovea widely concave, with a seta on each side; ligula thick and short, adnated to paraglossae, 8-setose at apex; palps moderately elongated, glabrous except 2 nd labial palpomere which is unisetose on inner margin, and with an additional seta medially on outer margin and another on inner side of subapex; 2 nd labial palpomere 1.3 times as long as 3 rd, 3 rd maxillary palpomere 1.1 times as long as 4 th; suborbital pore present (Figure 6A); antennae rather short and stout, pubescent from 2 nd antennomere; scape stouter, as long as pedicel, the 3 rd – 5 th longest, the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.00) / 3 rd (1.40) / 4 th (1.40) / 5 th (1.35) / 6 th (1.35) / 7 th (1.30) / 8 th (1.20) / 9 th (1.10) / 10 th (1.00) / 11 th (1.40). Pronotum almost as long as head including mandibles, much wider than head, PW/HW = 1.42; slightly wider than long, PW/PL =1.11; base and front straight, base slightly wider than front PbW/PfW = 1.10; lateral margin feebly bordered throughout, strongly and feebly contracted forwardly and backwardly respectively, nearly straight before hind angles; fore latero-marginal setae at about apical 2/9; disc moderately convex; median line well-defined, basal transversal impression and foveae well-marked. Scutellum small. Elytra elongated and a little amygdaloid, much longer than wide, EL/EW = 1.72; much wider than pronotum, EW/PnW = 1.59; lateral sides finely bordered throughout, marginal gutters well-marked; disc moderately convex, depressed medially near base; striae fine, punctures of striae invisible, intervals slightly convex. Chaetotaxy (Figure 6B): dorsal and preapical pores well marked, anterior and medial dorsal pores located on 3 rd stria, at about 2/9 and middle of elytra from base respectively; the preapical pore located at the apical anastomosis of 2 nd and 3 rd striae, and at about apical 1/6 of elytra, much closer to elytral suture than to apical margin; basal pore present; 4 th pore not backwardly shifted; 7 th, 8 th and apical pores distant from marginal gutter; the anguloapical pore present, closer to elytral margin than to suture. Legs thin and slender, bearing setae or short pubescence; the 1 st tarsomere much shorter than 2 nd –4 th tarsomeres together in fore leg, whereas as long as and longer than those in middle and hind legs respectively. Ventrites smooth, IV–VI each with two pairs of paramedial setae VII bisetose apically in male. Male genitalia (Figure 6C, D): The median lobe of aedeagus slender and moderately elongate, base small, slightly arcuate at middle, distinctly narrowed at apex, which is pointed and reflexed; endophallus armed with a small copulatory piece which is about 1/5 as long as the median lobe; in dorsal view the apical lobe widened, broadly rounded at apex; parameres much shorter than the median lobe, each bearing four long setae at apex. Etymology. Named after Mr. Zegang Feng, an expert on Pseudoscorpions in Hebei University, Baoding, who collected the type specimen. Distribution. China (Guizhou). Known only from the cave Da Dong in Shuicheng (Figure 7). Da Dong is located in Tuoluo village, opening on a sub hill and with a large entrance. Inside this short cave there are some nice speleothems. A small underground stream runs through the main passage, which is wet in most parts. Unfortunately, the cave fauna is very poor. In order to get more material, we visited this cave in July 2020 and searched carefully throughout the main passage but found nothing., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 11-15, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400

Zunotrechus zhaojieyui n. sp. Figures 1c, 23–25 Material. Holotype male, Da Dong, Bali, Bozhou, Zunyi Shi, Guizhou Province, 23.16 N, 113.36 E, 922 m, 2019- IV-2, Mingyi Tian leg., in SCAU. Diagnosis. Anophthalmic-like species, though head more or less semi-aphaenopsian, body smooth, not pubescent, head as long as pronotum, antennae not extending over apices of elytra, fore part evidently shorter than elytra. Description. Length: 5.2 mm; width: 1.8 mm. Habitus as in Figure 23A. Body yellowish brown, mouthparts palps pale; head with several setae on genae, pronotum with several long setae sparsely scattered on disc, elytra with sparse and short setae; microsculptural engraved meshes more or less moderately transverse on head, pronotum and elytra; fore body much shorter than elytra, (HLm+PL) / EL = 0.88. Head elongate, longer than wide, HLm/HW = 1.98, HLl/HW = 1.40; genae feebly expanded, widest at about basal 1/3 of head excluding mandibles; frons and vertex moderately convex; clypeus transverse, 4-setose; labrum bisinuate at frontal margin, 6-setose, median two smaller and shorter; frontal furrows sub-parallel-sided at most part, strongly divergent posteriorly; mandibles moderately developed, feebly curved apically; anterior and posterior supraorbital setiferous pores located at about basal 3/7 and basal 2/11 of head respectively; ligula adnated with paraglossae, 8-setose at apex; palpomeres moderately long and elongate, smooth and glabrous except the 2 nd labial palpomere bisetose on inner margin, with two additional setae on outer margin; the 2 nd labial palpomere 1.2 times longer than 3 rd, the 3 rd maxillary palpomere as long as 4 th; Antennae pubescent from pedicel; scape with several long setae, smooth and stouter than other, as long as pedicel, the 3 rd and 5 th longest, the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.00) / 3 rd (1.71) / 4 th (1.47) / 5 th (1.70) / 6 th (1.53) / 7 th (1.52) / 8 th (1.54) / 9 th (1.33) / 10 th (1.12) / 11 th (1.49). Pronotum as long as wide; much wider than, and as long as head, PnW/HW = 1.32, PnL/HLl = 0.94; widest at about apical 1/6 where exactly the anterior marginal seta located, then gently contracted backwardly to hind angle, more so forwardly to fore angle; base narrower than front, PbW/PfW = 0.78, both unbordered, base slightly emarginate, while front nearly straight; disc moderately convex; fore and posterior transverse impressions well marked, basal foveae large; median line clear. Scutellum quite small. Elytra much longer than wide, EL/EW = 1.61; expanded posteriorly; much wider than pronotum; lateral sides sub-parallel-sided, marginal gutters well-marked, apical striole weakly-defined; chaetotaxy (Figure 23B): basal pore present; dorsal and preapical pores large and well-marked, each with a large and long setae; anterior dorsal pore located at about basal 1/5, while posterior one at about apical 3/8; preapical pore at about apical 1/7 of elytra, much closer to suture than to apical margin; the 5 th and 6 th pores of marginal umbilicate series widely spaced; the anguloapical pore present. Legs moderately developed for cave trechines, bearing setae or short pubescence; tibiae without longitudinal sulcus; the 1 st tarsomere much shorter than 2 nd –4 th tarsomeres together in fore leg, whereas as long as and longer than those in middle and hind legs respectively. The 1 st protarsomere enlarged, denticulate inwardly at apex in male. Ventrites smooth, IV–VI each with a pair of paramedial setae, VII bisetose apically in male. Male genitalia (Figure 24): The median lobe stout, base small, apical portion broad, with a fairly large copulatory piece in inner sac which is about 1/4 as long as median lobe; in dorsal view, apical lobe widely opened; parameres extraordinary developed, very wide, shorter than median lobe, each with four long setae at apex. Genital ring with a very long handle. Female: Unknown. Etymology. In honour of Mr. Jieyu Zhao, the leader of Zunyi Caving Expedition (Zunyi), who provided a lot assistance for our field trip in Guizhou Province. Distribution. China (Guizhou). Known only from a limestone cave called Da Dong in Zunyi Shi (Figure 1c). Da Dong is located at the northern most part of Bozhou Qu, southwest Zunyi Shi, just near Bali village. After ca 300 metres through the large main passage, there is an underground creek which is partly accessible. Just close to the creek, there is a large chamber with some beautiful stalactites. Most part along the creek is wet and the unique specimen was found on the ground. Other cave animals observed in Da Dong were a beetle of the genus Zhijinaphaenops sp., a millipede (Pacidesmus sp.) and a non-glowing stick worm (Figure 25)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 38-41, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400

Pangaphaenops n. gen. Type species: Pangaphaenops seraphicus n. sp. (Suolue Cave I, Hechi, Guangxi) Generic characteristics. Small-sized for cave trechines; highly modified aphaenopsian, body elongate, fore part (head plus prothorax) including mandibles as long as elytra; surface smooth and glabrous, but head with a few sparse setae on genae; head elongate, somewhat Sinaphaenops -like, longer than prothorax excluding mandibles, neck constriction well-marked; presence of two pairs of supraorbital setiferous pores; frontal furrows fairly short, slightly and strongly divergent anteriorly and posteriorly respectively; frons rather flat, vertex strongly convex; clypeus quadrisetose, labrum shallowly emarginate at frontal margin; right mandibular tooth bidentate; mentum and submentum completely fused; mentum bisetose, base largely concave; tooth short and blunt, uni-fid at apex; submentum with a row of 8 setae; 2 nd labial palp bisetose on inner margin; antennae thin and slender, extending to apical margins of elytra; prothorax moderately tumid, propleura visible from above; pronotum barrel-shaped, narrow, as wide as head; widest a little behind middle; fore and hind angles obtuse; presence of two pairs of lateromarginal setae; disc moderately convex, base as wide front; elytra elongated ovate, widest at about middle; humeral angles completely rounded off; lateral margins finely bordered throughout, smooth and glabrous; disc moderately convex, striae obsolete and not traceable; apical striole absent; presence of two dorsal and the preapical pores; only the 2 nd marginal umbilicate pore closer to the marginal gutter than other; humeral set not aggregated, the 1 st pore inwardly and backwardly shifted; median set close to each other; protarsomeres not modified in male; tibiae not sulcate longitudinally; male genitalia weakly-sclerotized, very short and stout, hardly arcuate medially; base small, without sagittal aileron, apical lobe straight, broadly blunt at apex; parameres fairly developed, apices roundly broad, each with 4 setae, which are rather short, at apical portion. Remarks. Pangaphaenops n. gen. is a peculiar lineage which is not close to any group of cavernicolous trechines recorded in Guangxi and Guizhou. At first sight, it looks like a small-sized Sinaphaenops (s. str.) species (Uéno & Wang 1991), and with similar configurations of head and prothorax. Furthermore, its elytral striae are also completely disappeared and so un-traceable. The chaetotaxy is similar in Sinaphaenops (s. str.) too. But it is so different from Sinaphaenops (s. str.) in many aspects, such as: its propleura are much less expanded than in Sinaphaenops (s. str.) species, pronotum with two pairs of latero-marginal setae instead of unisetose, its elytral humeral angles rounded, protarsomeres not modified in male, and in particular its male genitalia is very short, stout and not the same kind as in Sinaphaenops (s. str.) species. In the light of molecular analyses apart from morphological characteristics, the position of this interesting genus would be determined. Etymology. “Pang” + “Aphaenops”. Dedicated to the late Prof. Xiongfei Pang (SCAU), a famous Entomologist and an academician of Chinese Academy of Sciences. Gender masculine. Range. China (Guangxi) (Figure 1h)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on page 33, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Ueno, S. I. & Wang, F. X. (1991) Discovery of a highly specialized cave trechine (Coleoptera, Trechinae) in Southeast China. Elytra, 19, 127 - 135."]}

Pangaphaenops seraphicus n. sp. Figures 1h, 20–22 Type material. Holotype male, Cave I, Suolue Town, Bama Yao Autonomous County, Hechi Shi, Guangxi Zhuang Autonomous Region, Southern China, 113.36°E, 23.16°N, 532 m, 2022-VI-21, leg. Jingli Cheng, in SCAU. Diagnosis. Small-sized and Sinaphaenops -like beetles, with very long antennae and legs, eyeless and depigmented, head much longer than prothorax. Description. Length: 5.8 mm; width: 1.7 mm. Habitus as in Figure 20. Body brown, but antennae, mouthparts palps and tarsi pale yellow; moderately shiny; head with a few sparse setae on genae and in front of neck constriction, pronotum, elytra and abdominal ventrites glabrous; legs covered with short pubescence, antennae pubescent from the 2 nd to 11 th joints; microsculpture: engraved meshes moderately transverse on head, irregularly but more or less transversal striate on pronotum and elytra. Ventral head sparsely setose; suborbital pores near neck constriction; each coxa with two setae in middle and hind legs, unsetose in fore leg; prosternum with four or five long setae; meso- and metasterna smooth and glabrous. Head elongate, much longer than wide, HLm/HW = 2.52, HLl/HW = 2.10; genae not evidently expanded medially, widest at about middle of head including mandibles, gradually narrowed posteriorly and strongly contracted before neck constriction; labrum transverse, 6-setose, median two smaller and shorter; anterior supraorbital setiferous pores located at about middle of head and the posterior ones just in front of neck constriction; mandibles fairly short though well-developed, feebly curved apically; labial suture completely disappeared, mentum tooth fine, unified at tip, much shorter than lateral lobes; ligula thick and short, 8-setose at apex, inner two much longer than other; palps thin and elongate, all glabrous but bisetose on inner margin of 2 nd labial palpomere (without additional seta on outer margin), penultimate palpomere 1.20 and 1.10 times longer than the apical one in labium and maxillary respectively; suborbital pores close to neck constriction; antennae thin, scape shortest, glabrous, stouter than others, slightly shorter than pedicel; the 4 th and 5 th longest, the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.20) / 3 rd (1.82) / 4 th (2.08) / 5 th (2.19) / 6 th (2.00) / 7 th (1.72) / 8 th (1.54) / 9 th (1.43) / 10 th (1.21) / 11 th (1.44). Prothorax elongate, shorter than head, PrL/HLm = 0.62, PrL/HLl = 0.83; slightly wider than head, PrW/ HW = 1.12; much longer than wide, PrL/ PrW = 1.51; wider than pronotum, PrW/PnW = 1.13; propleura invisible from above in apical 1/3, widest at about basal 1/3. Pronotum much longer than wide, PnL/PnW = 1.73; almost as wide as head, PnW/HW = 0.88; base slight wider than front, PbW/PfW = 1.10; lateral margin feebly bordered throughout, widest at about middle, then gently narrowed forwardly and backwardly; anterior latero-marginal setae located at about apical 2/11, whereas posterior ones distant from hind angles; fore transverse impression faint, while the posterior one well marked, median line clear. Scutellum moderately sized. Elytra longer than wide, EL/EW = 1.68; somewhat expanded posteriorly; much wider than pronotum, EW/PnW = 2.15; striae invisible but 1 st stria traceable in basal half. Chaetotaxy (Figure 21A): basal pore present; dorsal and preapical pores large and well-marked and easily recognized, anterior dorsal pore located at about basal 2/9 of elytra, posterior one at about middle, marginal umbilicate set, preapical pore at about apical 1/7 of elytra, closer to suture than to apical margin; 1 st pores of the marginal umbilicate series located at the position of 6 th stria and behind level of 2 nd, 4 th pore closer to 5 th than to 3 rd; the anguloapical pore present. Legs thin and very slender; the 1 st tarsomere slightly shorter than 2 nd –4 th tarsomeres together in fore leg, whereas longer than those in middle and hind legs respectively. Ventrites smooth, IV–VI each with a pair of paramedial setae, VII bisetose apically in male. Male genitalia (Figure 21B, C): The median lobe of aedeagus with a large copulatory piece in inner sac which is widely opened dorsally, paramere subequal sized. Female: Unknown. Etymology. From Medieval Latin, relating to seraph; sublime. Refers to this beautiful new species. Distribution. China (Guangxi). Known only from the Suolue Cave I in western Bama Yao Autonomous County (Figure 22). This anonymous cave is located at a small village about 6 kilometres from Suolue Town. It has two entrances along a remote road and is about 500 metres long. There are some stalactites inside the cave and, in particular, many soda straws of various kinds. Large parts of the main passage were wet and so good for cave creatures. The unique beetle specimen was observed running on a wall of a stalactite in a small chamber about 230 metres from the left entrance. Other cave animals observed also were bats, crickets, spiders, ant-loving beetles and three species of millipedes (Figure 22)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 33-37, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400

Chenotrechus parvulus n. sp. Figures 1k, 8–11 Material. Holotype male, the cave Xiniuyan, Guhang, Luxin, Wuxuan, Laibin, Central Guangxi Zhuang Autonomous Region, Southern China, 109.55°E, 23.56°N, 115 m, 2021-I-15, leg. Mingyi Tian, Weixin Liu & Yi Zhao, in SCAU; Paratypes: 2 males, idem, in SCAU. Diagnosis. Small-sized aphaenopsian species, elytra longer than fore body, surface glabrous, eyeless and depigmented; propleura visible from above, elytra widened posteriorly, striae vanished. Description. Length: 4.3–4.8 mm; width: 1.3–1.4 mm. Habitus as in Figure 8. Body yellow to brown, but antennae, mouthparts, palps and tarsi pale; moderately shiny; head with a few sparse setae on genae, pronotum and elytra glabrous; ventrites covered with short pubescence; microsculptural engraved meshes moderately transverse on head and pronotum, irregular or vanished on elytra; fore body much shorter than elytra, (HLm+PL) / EL = 0.85–0.88. Head elongate, much longer than wide, HLm/HW = 1.96–1.97, HLl/HW = 1.70–1.71; genae not evidently expanded medially, slightly narrower posteriorly, widest at about middle of head excluding mandibles; frons and vertex moderately convex; clypeus and labrum transverse, labrum 6-setose, median two smaller and shorter; anterior supraorbital setiferous pores located at about middle and the posterior ones in front of neck constriction; mandibles short and stout, feebly curved apically, right mandibular tooth tridentate though median one reduced; labial suture clear at sides, disappeared at middle, mentum tooth much shorter than lateral lobes; ligula thick and short, 8-setose at apex, inner two much longer than other; palps thin and elongate, all glabrous but bisetose on inner margin of 2 nd labial palpomere and with an additional seta on outer margin at subapex, penultimate palpomere 1.25 times longer than the apical one in labium, and as long as in maxillary; suborbital pores close to neck of head (Figure 9A); antennae pubescent from pedicel; scape glabrous and stouter than other, as long as pedicel, the 3 rd – 6 th longest, the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.00) / 3 rd (2.46) / 4 th (2.46) / 5 th (2.46) / 6 th (2.46) / 7 th (2.27) / 8 th (2.00) / 9 th (1.91) / 10 th (1.82) / 11 th (2.27). Prothorax slightly longer than wide, PrL/ PrW = 1.05–1.11; distinctly wider than pronotum, PrW/PnW = 1.20– 1.24; slightly wide than head, PrW/ HW = 1.04; widest at about middle. Pronotum much longer than wide, PnL/ PnW = 1.20–1.33; shorter than head, PnL/HLl = 0.75–0.80; slightly narrower than head, PnW/HW = 0.90; base narrower than front, PbW/PfW = 0.88–0.90; lateral margin feebly bordered throughout, widest at about apical 1/6 where antero-marginal seta located, strongly bi-sinuated and serrated near base, the posterior latero-marginal seta sited on the frontal serration, distant from hind angle; strongly and feebly contracted forwardly and backwardly respectively, nearly straight before hind angles; fore and posterior transverse impressions well marked, median line clear. Scutellum quite large. Elytra ovate, longer than wide, EL/EW = 1.61–1.65; expanded posteriorly; much wider than pronotum, EW/ PnW = 2.04–2.12; lateral sides finely bordered throughout, marginal gutters well-marked; dorsal surface depressed medially near base; striae invisible, and neither of intervals. Chaetotaxy (Figure 9B): basal pore present; dorsal and preapical pores large and well-marked, each with a large and long setae, anterior dorsal pore located at about basal 2/7, posterior one at the level of the middle marginal umbilicate set, preapical pore at about apical 1/7 of elytra, closer to suture than to apical margin; 1 st to 3 rd pores of the marginal umbilicate series equidistantly spaced sited, 4 th shifted posteriorly, 5 th and 6 th pores of the median set located behind middle; the anguloapical pore absent. Legs thin and moderately slender for cave trechines, bearing setae or short pubescence; the 1 st tarsomere much shorter than 2 nd –4 th tarsomeres together in fore leg, whereas as long as and longer than those in middle and hind legs respectively. Ventrites smooth, IV–VI each with two pairs of paramedial setae, VII bisetose apically in male. Male genitalia (Figure 10): The median lobe of aedeagus with a small copulatory piece in inner sac which is widely opened dorsally, paramere subequal sized, each with four long setae at apices. Genital ring broad, with a short handle. Female: Unknown. Etymology. Refers to the small size of this new species. Distribution. China (Guangxi). Known only from a cave called Xiniuyan in Laibin Shi (Figure 1k). Xiniuyan is located at Guhang Village. It is 2750 m long, with several large chambers and there are some beautiful speleothems inside. Water pools exist in some parts of the main passage, making a suitable habitat for cave animals. Apart from the blind beetles, a millipede of Glyphiulus species and a scutiger were also observed in the cave (Figure 11)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 15-20, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400

Hurites yunxianicus n. sp. Figures 1l, 17–19 Material. Holotype male, Yunxian Dong, Longhui County, Shaoyang, Central Hunan, 27.28 N, 110.89 E, 425 m, 2019-IV-30, leg. Mingyi Tian, Mengzhen Chen & Zijun Ma, in SCAU. Diagnosis. Anophthalmic, large-sized for a species of the Cimmeritodes complex, body depigmented, elytra wholly covered with punctures. Description. Length: 5.9 mm; width: 1.9 mm. Habitus as in Figure 17. Body relatively thin and elongated, whole body densely pubescent, setae longer on head and pronotum, and shorter on elytra and underside surface; microsculptural engraved meshes indistinct; body brown, but mouthparts, palps and tarsi pale. Fore body including mandibles shorter than elytra, (HLm+PnL)/EL = 0.83. Head longer than wide, HLm/HW = 1.62, HLl/HW = 1.12, shorter (excluding mandibles) than pronotum, HLl/ PnL = 0.88, narrower than pronotum, HW/PnW = 0.75; genae subparallel-sided, densely setose, frons and vertex glabrous, widest at middle of head from labrum, frontal furrows long and deep, more divergent posteriorly, anterior and posterior supraorbital setiferous pores located at about basal 4/9 and 2/9 from base to labrum respectively; mandibles moderately developed, feebly curved apically; clypeus 4-setose, labrum emarginate at front, 6-setose; labial suture absent; mentum bisetose, base widely concave, tooth short and finely bifid at tip; submentum 2-setose (in holotype specimen), or 6-setose (in paratype); ligula thick and short, multisetose at apex; palpomeres long and thin, all glabrous except 2 nd labial palpomere bisetose on inner margin, with an additional seta medially on outer margin; 2 nd labial palpomere 1.3 times as long as 3 rd, 3 rd maxillary palpomere 1.2 times as long as 4 th; suborbital setae present (Figure 18A); antennae thin, pubescent from pedicel, scape stouter than others, as long as pedicel; 3 rd as long as 5 th, both are longest; comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.21) / 2 nd (1.00) / 3 rd (1.84) / 4 th (1.63) / 5 th (1.90) / 6 th (1.81) / 7 th (1.72) / 8 th (1.54) / 9 th (1.53) / 10 th (1.41) / 11 th (1.55). Pronotum subquadrate, almost as long as wide, much narrower than elytra, PW/EW = 0.45; widest at about 1/4 from front, side margins evenly reflexed, more constricted backwards than forwards, suddenly sinuate before hind angles; base nearly straight, but sides contracted forwardly near hind angles, slightly narrower than front; the anterior latero-marginal setae located at the widest point of pronotum, and the posterior just before hind angle; disc moderately convex, anterior transversal impression faint, while posterior one well-marked. Scutellum small. Elytra elongate ovate, moderately convex dorsally, EL/EW = 1.68; whole side margins subserrate and ciliate, humeral angles widely rounded; scutellar striae absent; basal pore present; two dorsal pores present along the 3 rd stria, located at about basal 1/4 and apical 1/3 of elytra respectively, preapical pore located on the 3 rd stria, at about apical 1/7 of elytra much closer to suture than to apical margin of elytra; the humeral group of marginal umbilicate pores equidistantly located, the 1 st and 2 nd pores closer to marginal gutter; the 5 th and 6 th pores of the middle group very widely spaced, making 5 th much closer to 4 th than to 6 th; the anguloapical pore present, equidistant to elytral margin and to suture. Legs moderately slender, tibiae without longitudinal sulcus; the 1 st tarsomere much shorter than, as long as and slightly longer than the 2 nd− 4 th combined in fore, middle and hind legs, respectively. The 1 st and 2 nd protarsomeres of male evidently widened. Prosternum rugose, with puncture-like structure; ventrites shortly pubescent; ventrites IV–VI each with a pair of paramedial setae, VII bisetose apically in male. Male genitalia (Figure 8): Weakly-sclerotized, median lobe thin and elongated, moderately arcuate at median portion, apex flattened in lateral view; base small, sagittal aileron fairly large; inner sac armed with a large longitudinal copulatory piece which is about 2/7 as long as the median lobe; in dorsal view, apical lobe thin and tubiform, gradually narrowed towards apex which is rounded; parameres elongate, similar each other, much shorter than median lobe, right one provided with 3 long setae at apex, whereas 4 on the left. Female: Unknown. Etymology. Refers to Yunxian Dong, the type locality of this new species. Distribution. China (Hunan). Known only from the cave Yunxian Dong in Longhui County (Figure 1l). Yunxian Dong is a limestone cave near Shishan Village, about 40 km from the main town of Longhui County. It is an abandoned show cave. The total length is 1.2 km and there are some beautiful speleothems inside. The single beetle was found and collected in a wet area,about 200 metres from the entrance. Apart from cave beetles, a leech of the genus Sinospelaeobdella and a millipede (Glyphiulus sp.) were also observed in the cave (Figure 19)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on page 29, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400

Ecotrechus n. gen. Type species: Ecotrechus ruruiae n. sp. (Laba Dong, Ziyun, Guizhou) Generic characteristics. Medium-sized for cave trechines, anophthalmic though head with uncompleted frontal furrows; body stout, brown, elytra much longer than fore body including mandibles; surface smooth and glabrous. Head elongate, much longer than wide, nearly parallel-sided; neck narrow, constriction well-marked; absence of supraorbital setiferous pores; frontal furrows parallel-sided in most part, divergent and superficial posteriorly; frons slightly but vertex strongly convex; right mandibular tooth bidentate; labium completely fused; mentum bisetose, tooth short, and bifid at tip, base largely concaved; submentum 8 or 9-setose; antennae rather short, extending at about 3/5 of elytra from base, scape slightly widened, shorter than pedicel. Propleura invisible from above; pronotum almost rounded, widest at about middle; lateral margins narrowly and evenly reflexed in most part, wider before hind angles, without latero-marginal setae; both fore and hind angles rounded; base slightly narrower than front, both unbordered; disc moderately convex, both anterior and posterior transversal impressions superficial, median line well marked; basal foveae small and shallow. Elytra ovate, strongly convex; humeral angles widely rounded, whereafter slightly contracted and sinuate; lateral margins finely beaded, smooth but sub-serrate and ciliate from humeral angle and ended before the widest point; widest at about middle; surface depressed near base; striae deep, comprised of large, isolated punctures; intervals convex; absence of dorsal and preapical pores; the marginal umbilicate pores not aggregated, only the 2 nd pore close to marginal gutter, 4 th distant from 3 rd; the 5 th and 6 th pores closed to each other. Legs moderate elongate for cave trechines; protibiae longitudinally sulcated. Ventrites IV– VI each with two pairs of paramedian setae, ventrite VII quadrisetose in female. Remarks. Ecotrechus n. gen. is a peculiar genus with no evident relative within Chinese cave trechines. Lack of supraorbital setiferous pore on head, absence of latero-marginal setae on pronotum and of dorsal and preapical pores on elytra are the striking unique generic characters of this new genus. At the first sight, Ecotrechus n. gen. is more or less similar to Libotrechus Uéno, 1998, which is ranging from southern Guizhou (Libo County), through northern (Huanjiang Maonan Autonomous County) to central (Du’an Yao Autonomous County) Guangxi (Uéno & Ran 1998, Lin & Tian 2014), in body shape in particular the pronotum. However, it is very different from Libotrechus in many aspects, for example: (1) head more elongated in Ecotrechus n. gen., whereas stouter in Libotrechus; (2) labium completely fused in Ecotrechus n. gen., vs. mentum and submentum well separated by a clear labial suture in Libotrechus; (3) scape of antennae shorter than pedicel in Ecotrechus n. gen., vs. subequal in Libotrechus; (4) pronotum almost rounded in Ecotrechus n. gen., vs. subcordate in Libotrechus. Etymology. “Ec-” + trechus. “Ec” is abbreviated for Explore China, an active caving team in China. Gender masculine. Range. China (Guizhou) (Figure 1f).

Ecotrechus ruruiae n. sp. Figures 1f, 15–16 Type material. Holotype female, the cave Laba Dong, Shaba, Ziyun Buyi & Miao Autonomous County, Guizhou Province, 25.84 N, 106.08 E, 1450 m in altitude, 2022-V-16, Rurui Ye leg., in SCAU; paratypes: 2 females, idem, in SCAU. Diagnosis. A medium-sized anophthalmic, eyeless and brown, somewhat like a Libotrechus species, but without supraorbital pores on head, latero-marginal setae on pronotum and dorsal and preapical pores on elytra. Description. Length: 6.3–6.6 mm; width: 2.4 mm. Habitus as in Figure 15A. Body brown, but mouthparts, palps and tarsi pale; surface glabrous and moderately shiny; ventrites covered with short pubescence; microsculptural engraved meshes more or less isodiametric on head, moderately or strongly transverse on pronotum and elytra; fore body much shorter than elytra, (HLm+PL) / EL = 0.93. Head elongate, much longer than wide, HLm/HW = 1.78–1.82, HLl/HW = 1.30–1.38; genae feebly expanded medially, widest at about middle of head excluding mandibles; clypeus transverse, 4-setose; labrum transverse, feebly bisinuate at frontal margin, 6-setose; mandibles fairly developed, feebly curved and slightly hooked at tips; mentum and submentum completely fused, ligula 6-setose at apex, inner two much longer than other; palps moderately elongate, glabrous except 2 nd labial palp bisetose on inner margin, with an additional seta on outer margin at subapex, about 1.2 times longer than 3 rd; 3 rd maxillary palp slightly longer than 4 th (1.1 times); suborbital pore absent; antennae pubescent from pedicel; scape glabrous, the 3 rd – 5 th longest; comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.32) / 3 rd (1.41) / 4 th (1.33) / 5 th (1.40) / 6 th (1.31) / 7 th (1.22) / 8 th (1.10) / 9 th (1.11) / 10 th (1.11) / 11 th (1.19). Pronotum discoid, slightly wider than long, or as long as wide (a paratype specimen), PnL/PnW = 0.96–1.00; slightly shorter than head, PnL/HLl = 0.96–0.98; much wider than head, PnW/HW = 1.42–1.50; base slightly narrower than front, PbW/PfW =0.85–0.91, both straight. Scutellum very small. Elytra ovate, much longer than fore body; longer than wide, EL/EW = 1.48–1.52; evidently contracted posteriorly; much wider than pronotum, EW/PnW = 2.04–2.12; lateral sides finely bordered throughout, marginal gutters well-marked; striae well-marked, punctures deep. Chaetotaxy (Figure 15B): basal pore present; dorsal and preapical pores absent; 1 st to 3 rd pores of the marginal umbilicate series equidistantly spaced, 4 th isolated; 5 th and 6 th pores of the median set located behind middle, very close to each other; the anguloapical pore present, closer to elytral margin than to suture. Legs moderately slender, bearing dense setae or short pubescence; procoxa asetose, middle and hind ones with two and three setae respectively; pro- and mesotrochanters unisetose, metatrochanter with several setae; the 1 st tarsomere much shorter than, as long as, and slightly longer than 2 nd –4 th tarsomeres together in fore, middle and hind legs, respectively. Prosternum glabrous, meso- and metasterna sparsely setose. Abdominal ventrites pubescent; IV–VI ventrites each with a pair of paramedial setae, VII ventrite quadrisetose in female. Male: Unknown. Etymology. In honour of Ms. Rurui Ye, an active caver of “Explore China ” team, who discovered and collected the type series. Distribution. China (Guizhou). Known only from a cave called Laba Dong in Ziyun County (Figures 1f). Laba Dong is a pothole of about 110 metres deep. It is located in a valley about 1.5 kilometres from Shaba Village. The beetles were found and collected in a platform about 90 metres deep from entrance. More beetle individuals were observed in the deepest part. Ecotrechus ruruiae n. sp. is co-occurring with Sinaphaenops bidraconis Uéno, 2002, an aphaenopsian cave beetle (Figure 16).

Deuveaphaenops (Furongius) huangheae n. sp. Figures 1b, 32–34 Material. Holotype female, Shisanya Dong, Jinming, Sanqiao, Daozhen, northern Guizhou, 2022-IV-12, leg. Huanghe Zhou, in SCAU. Diagnosis. Small-sized for cave trechine, semi-aphaenopsian, wholly pubescent, Description. Length: 4.5 mm; width: 1.4 mm. Habitus as in Figure 32. Body elongate, sparsely and shortly pubescent, propleura and prosternum glabrous, abdominal ventrites and legs covered with dense and long pubescence; whole body brown, but mouthparts, palps, antennomeres and tarsi pale yellow. Microsculptural engraved meshes moderately transverse on head, strongly transverse on pronotum and elytra. Fore body shorter than elytra, (HLm+PnL)/EL = 1.09. Head much longer than wide, HLm/HW = 2.24, HLl/HW = 1.69, longer than pronotum, HLm/PnL = 1.65, HLl/ PnL = 1.23, narrower than prothorax and pronotum, HW/PrW = 0.84, HW/PnW = 0.88; widest at middle of head from labrum, genae feebly expanded; frons and vertex moderately convex, frontal furrows deep, divergent and reduced posteriad; anterior and posterior frontal setiferous pores located at about middle and basal 1/4 of head; clypeus transverse, 6-setose; labrum transverse, frontal margin shallowly bisinuate, 6-setose; mandibles fairly developed, feebly incurved at apical half, right mandibular tooth tridentate; labial suture completely disappeared; palps slender and subcylindrical, the 3 rd maxillary palpomere slightly shorter (0.91 times) than 4 th, 2 nd labial palpomere slightly longer (1.10 times) than 3 rd; palps glabrous except the 2 nd labial palpomere bisetose on inner margin and with two additional setae on outer margin at middle and subapical part respectively; labial suture disappeared; mentum bisetose, tooth thin, bifid at tip, basal largely foveate; submentum 6-setose; antennae slender, extending at about apical 1/3 of elytra; scape stoutest and shortest, the 5 th longest; the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.33) / 3 rd (1.76) / 4 th (1.78) / 5 th (1.86) / 6 th (1.76) / 7 th (1.62) / 8 th (1.43) / 9 th (1.43) / 10 th (1.29) / 11 th (1.80). Prothorax slightly longer than wide, PrL/PrW = 1.12, propleura feebly convex and visible from above, wider than head, almost as wide as pronotum, PrW/PnW = 1.02, widest at about middle. Pronotum longer than wide, PnL/PnW = 1.13, much narrower than elytra, PW/EW = 0.45; disc moderately convex; fore latero-marginal setae at about 1/8 of pronotum from front, hind latero-marginal setae absent; widest at about 1/4 from front; base narrower than front, PWb/PWf = 0.85. Scutellum small. Elytra elongated, much longer than wide, EL/EW = 1.67; lateral margins subserrate near shoulders, and ciliate throughout; disc moderately convex; striae deep and well-marked; apical striole present; chaetotaxy (Figure 34): similar in Deuveaphaenops (Furongius) gelaophilus Tian & Huang, 2017; basal pores present; anterior and posterior setiferous dorsal pores on the 3 rd stria located at about basal 1/5 and a little behind middle of elytra respectively, preapical pore at about apical 1/5 of elytra, closer to suture than to apical margin of elytra; marginal umbilicate pores not aggregated; the 4 th pore widely separated from 3 rd; the anguloapical pore present. Legs moderately slender; tibiae without longitudinal sulcus; the 1 st tarsomere slightly shorter than, as long as and longer than the 2 nd− 4 th combined in fore, middle and hind legs, respectively. Male: Unknown. Remarks. Deuveaphaenops (Furongius) huangheae n. sp. is the second species of the subgenus Furongius Tian & Huang, 2017 (Huang et al. 2017). It is very similar to Deuveaphaenops (Furongius) gelaophilus Tian & Huang, 2017, but its head is stouter and a little more expanded, submentum 6-setose, instead of 8-setose in D. (F.) gelaophilus; strial punctures of elytra well-marked, whereas not clear D. (F.) gelaophilus; and the 4 th marginal umbilicate pore less backwardly shifted than in D. (F.) gelaophilus (Figure 33). Etymology. Dedicated to Ms. Huanghe Zhou (a very active member of Guilin Cave Exploration Team, Guilin), who discovered and collected the type specimen. Distribution. China (northern Guizhou Province) (Figure 1a). Known only from the cave Shisanya Dong in Daozhen Xian, Zunyi Shi. This cave was unexpectedly discovered during construction of tunnels for building a new road in early 2022. It is about 22 kilometres from Xianmi Dong, the locality of D. (F.) gelaophilus, in straight distance. It still has no natural entrance and its length remains unknown, but at least 5 kilometres regarding to the part across two tunnels (Huanghe Zhou, personal communication). There are several chambers and many beautiful stalactites inside the cave. Two beetle individuals were found running on floor in a wet place, about 200 metres from the nearer tunnel. Unfortunately, only one beetle was successfully collected (Figure 34). Genus Shilinotrechus Uéno, 2003, Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 50-54, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Tian, M. Y., Huang, S. B. & Wang, D. M. (2017) Discovery of a most remarkable cave-specialized trechine beetle from southern China (Coleoptera: Carabidae: Trechinae). ZooKeys, 725, 37 - 47. https: // doi. org / 10.3897 / zookeys. 725.21040","Huang, S. B., Cen, Y. J. & Tian, M. Y. (2017) A new genus and a new subgenus of cavernicolous beetles from Furong Jiang valley, southwestern China (Coleoptera: Carabidae: Trechinae). Annales de la Societe entomologique de France, New Series, 53 (4), 286 - 295. https: // doi. org / 10.1080 / 00379271.2017.1344566","Ueno, S. I. (2003) A new genus and species of extraordinary cave trechine (Coleoptera, Trechinae) from eastern Yunnan, Southwest China. Elytra, 31, 245 - 252."]}

Guizhaphaenops (s. str.) wanghaoi n. sp. Figures 1e, 38–40 Material. Holotype male, Weixiao Tiankeng, Gaoling, Qinglong County, Qianxinan Buyi & Miao Autonomous Prefecture, southwestern Guizhou Province, southwestern China, 23.16 N, 113.36 E, 1345 m, 2022-III-21, leg. Hao Wang, in SCAU; paratypes: 2 females, IBID, in SCAU. Diagnosis. Medium-sized trechine, semi-aphaenopsian, eyeless and depigmented, body glabrous and concolorous yellowish brown. Description. Length: 6.6–6.8 mm; width: 2.3–2.4 mm. Habitus as in Figure 38. Body yellowish brown, mouthparts, palps and antennae pale. Head, pronotum, elytra and underside of head and thorax smooth and glabrous. Microsculptural engraved meshes more or less isometric on head, while transversely striate on pronotum and elytra. Fore body much shorter than elytra, (HLm+PL) / EL = 0.86–0.87. Head elongate, longer than wide, HLm/HW = 1.95–1.96, HLl/HW = 1.45–1.57; genae feebly expanded, widest at about middle of head excluding mandibles; frons and vertex moderately convex; clypeus transverse, 4-setose; labrum shallowly emarginate at frontal margin, 6-setose, median two smaller and shorter; frontal furrows subparallel-sided in basal half, strongly divergent posteriorly; mandibles moderately developed, feebly curved apically, right mandibular tooth bidentate; only anterior supraorbital setiferous pores present, located at about the middle of the head respectively; labial suture absent, mentum bisetose, tooth short and bifid at tip, base largely concave; submentum 10-setose; ligula adnated with paraglossae, 8-setose at apex; palpomeres thin and elongate, the 2 nd labial palpomere bisetose on inner margin, with an additional seta on outer margin, the 3 rd maxillary palpomere with three setae at apex; 3 rd labial and 4 th palpomere maxillary palpomeres smooth and glabrous; the 2 nd labial palpomere 1.3 times longer than 3 rd, the 3 rd maxillary palpomere 1.2 times longer than 4 th; antennae pubescent from pedicel to 11 th antennomere; scape with several long setae, smooth and slightly stouter than other, the 10 th the shortest; the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.15) / 2 nd (1.25) / 3 rd (1.55) / 4 th (1.50) / 5 th (1.40) / 6 th (1.30) / 7 th (1.25) / 8 th (1.15) / 9 th (1.10) / 10 th (1.00) / 11 th (1.35). Propleura invisible from above. Pronotum sub-orbicular, as long as wide; much wider but shorter than head, PnW/HW = 1.24–1.33, PnL/HLm = 0.71–0.74, PnL/HLl = 0.84–0.86; lateral margins finely bordered and reflexed upwardly throughout, fore angles slightly protruding and obtuse, hind angles widely obtuse; widest at about apical 3/7; only the anterior marginal seta present, located at about apical 1/6 of pronotum, the posterior absent; base slightly narrower than front, PbW/PfW = 0.73–0.78, both unbordered; front slightly emarginate, while base nearly straight, but shortly curved near hind angles; disc moderately convex; fore and posterior transverse impressions weakly-marked, basal foveae indistinct; median line clear. Scutellum small. Elytra elongate ovate, much longer than wide, EL/EW = 1.58–1.60; slightly widened apically; much wider than pronotum, EW/PnW = 1.83–1.87; lateral margins finely bordered and smooth throughout, but ciliate near humeral portion, widest at about middle; disc strongly convex, striae shallow, punctures visible, intervals flat, apical striole not well-marked; chaetotaxy (Figure 39A): basal pore present; only a dorsal setiferous pore present on the 3 rd stria on each elytron, located at a little before middle; preapical pore present at about apical 2/13 of elytra, located in the anastomosis of 3 rd and 4 th striae, closer to elytral suture than to margin; the humeral group of the marginal umbilicate pores not aggregated, the 2 nd pore closer to marginal gutter than other, the 4 th pore widely separated from 3 rd; the middle group (5 th and 6 th pores) close to each other; the anguloapical pore absent. Legs moderately developed; fore tibia with a longitudinal sulcus on dorsal surface; the 1 st tarsomere much shorter than 2 nd –4 th tarsomeres together in fore leg, whereas as long as those in middle and hind legs respectively. The 1 st protarsomere elongated and slightly enlarged, denticulate inwardly at apex in male. Ventrites smooth at sides, with some short pubescence medially, IV-VI each with a pair of paramedial setae, VII bisetose apically in male, while quadrisetose in female. Male genitalia (Figure 39B,C):The median lobe moderately sclerotized, slender and elongate, widely emarginate; base small, with a large sagittal aileron; copulatory piece not well-marked, about 1/4 as long as the median lobe; apical lobe gradually tapered, apex blunt; in dorsal view, apical lobe narrowly rounded at the extremity; parameres moderately developed, similar each other in shape, the right and left each with four and three long setae at apex. Remarks. This new species is similar to Guizhaphaenops (s. str.) pouillyi Deuve & Quéinnec, 2014 recorded from Yin Dong (also known as Luoshui Dong II) along Gesuo River in Panzhou Qu of Liupanshui Shi, about 34 kilometres in linear distance from Weixiao Tiankeng (Deuve & Quéinnec 2014). However, G. (s. str.) wanghaoi has thinner head and pronotum, presence of posterior dorsal pore and the preapical pore on elytra vs. both absent but presence of anterior dorsal pore in G. (s. str.) pouillyi. Etymology. In honour of Mr. Hao Wang (an member of “Explore China ” team), who found and collected the type series. Distribution. China (Guizhou). Known only from Weixiao Tiankeng in Qinglong County (Figure 1e). Weixiao (which means “smiling” in Chinese) Tiankeng is located near Gaoling Village in southwestern Qinglong County. It has a wide and smiling-like opening and a depth of about 210 metres. The bottom connects to an underground creek (Figure 40). Along the main passage, there are several chambers and branches with high degree of humidity (Rurui Ye, personal communication). The type specimens were collected under stone in a chamber. Other cave animals also observed inside this Tiankeng were crickets, pseudoscorpions and frogs. Genus Graciliblemus Deuve & Tian, 2016, Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 57-61, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Deuve, T. & Queinnec, E. (2014) Deux nouveaux Trechini de la Chine du Sud-Ouest (Coleoptera, Caraboidea, Trechinae). Bulletin de la Societe entomologique de France, 119, 467 - 471. https: // doi. org / 10.3406 / bsef. 2014.2427","Deuve, T. & Tian, M. Y. (2016) Descriptions de sept nouveaux Trechini cavernicoles de la Chine continentale (Coleoptera, Caraboidea). Bulletin de la Societe entomologique de France, 121 (3), 343 - 354. https: // doi. org / 10.3406 / bsef. 2016.2174"]}

Hurites n. gen. Type species: Hurites yunxianicus n. sp. (Yunxian Dong, Shaoyang, Hunan) Generic characteristics. Large-sized for Cimmeritodes -like species, whole pubescent, anophthalmic, fore part (head plus pronotum) evidently shorter than elytra; head elongate, nearly parallel-sided, right mandible tridentate with teeth blunt; frontal furrows not parallel-sided, two pairs of supraorbital setiferous pores present, mentum and submentum fused; antennae rather short, extending to apical 1/4 of elytra; pronotum subquadrate, fore lateromarginal angles protruding, hind angles nearly rectangular, presence of two pairs of latero-marginal setae; elytra elongate, sides subserrate and ciliate throughout; surface densely punctate, striae faint and more or less traceable, intervals slightly convex; presence of two dorsal pores and the preapical pores on each elytron; the humeral group of marginal umbilicate pores aggregated, the 1 st and 2 nd pores close to marginal gutter; the 5 th and 6 th pores of the middle group very widely spaced, making 5 th much closer to 4 th than to 6 th; the 1 st and 2 nd protarsomeres widened, and denticulate inwardly at apices in male; male genitalia weakly-sclerotized, thin and elongate, presence of a moderately sized sagittal aileron, parameres much shorter than median lobe. Remarks. Hurites n. gen. is probably a member of Cimmeritodes Deuve, 1996 complex, in particular somewhat similar to the subgenus Shimenrites Deuve & Tian, 2017, which is also occurring in Hunan Province (Deuve & Tian 2017). However, it differs from the latter in: (1) mentum and submentum fused in Hurites n. gen., instead of separated in Shimenrites; (2) median group (5 th and 6 th pores) of the marginal umbilicate series extraordinarily removed each other in Hurites n. gen., instead of close to each other in Shimenrites; (3) the 1 st and 2 nd protarsomeres of male modified in Hurites n. gen., but both are simple in male in Shimenrites. Regarding the fact that many subgenera of Cimmeritodes should be treated as independent genera according to phylogenetic analysis based on molecular data, we would like to propose Hurites as a new genus rather than a new subgenus. Etymology. “Hu+ rites”, “Hu” means Hunan Province, indicating the distribution area of this new genus. Gender masculine. Range. China (Hunan) (Figure 1l)., Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on page 28, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/7642400, {"references":["Deuve, T. & Tian, M. Y. (2017) Un nouveau Cimmeritodes du Hunan nord-occidental (Coleoptera, Caraboidea, Trechidae). B ulletin de la Societe Entomologique de France, 122 (3), 295 - 296. https: // doi. org / 10.3406 / bsef. 2017.29389"]}

Guiodytes inexpectatus Tian & Zhou sp. nov. urn:lsid:zoobank.org:act: EA3D7117-F8F3-4F45-848A-9E3879ABCBF8 Figs 1, 3F, 4F, 9, 10D, 11 Diagnosis This new species is most similar to G. bedosae Tian, 2014, which also occurs in Longzhou County, by the similar character configuration of the head and elytra and the seven-setose labrum present in both species. It is easily separated from the latter species by its much larger body, conspicuously emarginate labrum, the strongly protruding fore angles of the pronotum and the special elytral setiferous chaetotaxy. Etymology The species epithet refers to the unexpected discovery of this new species. The single specimen was encountered by Jiajun Zhou (the second author) after diving in the cave. It is his first discovery of a new cave beetle. Type material Holotype CHINA ��� ♀, broken on the left supra-antennal plate; Guangxi, Longzhou, Xiadong, Zhuzhu Dong; 22��24���10.75��� N, 106��38���52.36��� E; alt. 170 m; 18 Oct. 2020; J. Zhou leg.; SCAU. Description Female MEASUREMENTS. Length: 7.5 mm; width: 2.4 mm. Habitus as in Fig. 9. BODY. Moderately depigmented, concolorous brown. HEAD. Stout (Fig. 3F), much longer than wide from apex of mandible, HLm/HW=1.44, or slightly shorter than wide when measured from apex of labrum, HLl/HW=0.97; clypeus strongly transverse and with anterior margin slightly, median part moderately concave, bisetose at base, frontoclypeal sulcus well marked, clypeal wings not projecting, nearly at same level as clypeus, distinctly separated from clypeus and supra-antennal plates by notches; supra-antennal plates well developed, reflexed margined, strongly convex, smooth and glabrous; frons and vertex moderately convex, with transverse rugosity; with two setiferous pores, situated at posterior end of supra-antennal plates and before neck constriction, respectively, frontal furrows distinct, wide, slightly divergent towards middle of frons, strongly divergent posteriorly; frontal carinae blunt, wide, parallel; eyes completely lacking; genae well developed, not parallel-sided, sides tumid; neck constriction distinct, wide; labrum transverse, frontal margin conspicuously emarginate as a semicircular incision, seven-setose along frontal part, with six cilia on both sides; mandibles short and stout. Palpomeres ensiform, glabrous, apical segments of maxillary palpomere about twice as long as penultimate one, labial palpomeres subequal; labial palpomere two bisetose on inner margin; ligula unisetose at apex; labial suture well marked; mentum well developed, with two pairs of setae, one pair situated beneath median tooth, the other at base near lateral margin, with two large and deep concavities near base; median tooth simple, blunt at apex, lateral lobes wide, gently and obliquely truncated; basal foveae slightly convex; submentum narrow, quadrisetose. Antennae filiform, elongated, reaching elytral base; scapus unisetose subapically, pedicellus smooth and glabrous, pubescent from antennomere three; antennomere three slightly longer than pedicellus, then gradually decreasing in length towards penultimate segment, which is slightly shorter than terminal segment. Underside of head rough. THORAX. Pronotum peltate (Fig. 3F), much wider than head, PW/HW =1.47, slightly shorter than wide, PL/PW=0.90; disc moderately convex; anterior margin unbordered, indistinctly convex in median portion, margin with a row of cilia throughout, anterior transverse line marked with punctation, fore angles strongly protruding; widest at end of second third, gently and gradually narrowed anteriorly, with conspicuous notch before posterior angle, posterior angle large, with two conspicuously toothed projections between posterior angle and basal constriction; with two lateral setiferous pores, anterior seta at about anterior fifth, posterior one slightly before notch at posterior angle; reflexed lateral margin slightly crenulate, lateral channel broad throughout, narrower before anterior seta, wider between anterior and posterior lateral setae, ending at notch of posterior angle; basal constriction wide, unbordered, with narrow transverse carina; median line engraved, wide, not joining basal constriction. Peduncle short, scutellum small. Prosternum and propleura smooth, with sparse punctures. ABDOMEN. Abdominal ventrites more or less punctured; ventrite seven with two pairs of subapical setae, widely separated at each side. WINGS. Elytra elongate ovate, strongly convex, wider than pronotum, EW/PW= 1.29, much longer than wide, EL/EW =1.67; widest at about one third from apex, slightly contracted anteriad and moderately and regularly contracted posteriad; base with a pair of setiferous punctures at base of stria one, intervals two and three each with a pair of small tubercles at base; shoulders broadly obtuse, with two large teeth on each side; apex pointed; sides distinctly crenulate from base to apical third, then indistinctly continued towards apex; elytral striae broad and well marked, with large and isolated punctures, only striae six and seven ending before reaching basal margin of elytron; intervals slightly convex; intervals six and seven carinate at base, joining and continuing into humeral tooth, interval eight carinate throughout, joining with seven before reaching base; arrangement of elytral setiferous chaetotaxy as in Fig. 3F: nine and six foveolate setiferous dorsal pores on interval three and five, respectively, pores nearly regularly arranged; with series of setiferous pores in marginal channel, uninterrupted and small, with several large pores bearing much longer setae. Hind wings reduced. LEGS. Moderately elongated; proleg stout, profemur moderately dilated, smooth, with a long seta and several short ones; protibia well developed, with distinct and complete carina dorsally, sulcus distinct, quadridentate; lateral teeth blunt at apex, lowest lateral much shorter than others, upper two stoutensiform; subapical spur elongate-ensiform, blunt at apex, shorter and more slender than uppermost lateral teeth; protarsi slender, tarsomere longer than tarsomeres two to four combined; meso- and metalegs slender, with width of tarsomeres in both narrower than in proleg; mesotibia gradually dilated towards apex, with an elongated tuber-like subapical spur, longer than wide and furnished with an isometric seta. GENITALIA (Fig. 10D). Similar to those of G. cavicola (Fig. 10B), gonosubcoxite IX stout, with one long seta and two short setae at median portion of outer margin; gonocoxite IX curved and slender, apex very sharp, with three dorsal and three ventral setae, plus two short and sturdy ensiform setae on outer margin. Male Unknown. Distribution China (Guangxi: Longzhou County) (Fig. 1). Known only from Zhuzhu Dong cave (Fig. 11). The cave is not easy to access due to the extremely narrow entrance as well as the vertical depth of three meters after the entrance. Then, it reaches a relatively wider and flat passage. But the ventilation of the passage is inadequate, causing the collector to experience symptoms of shortness of breath and chest distress. The single specimen was found on the muddy surface near the bank of an underground river, which is 50 meters from the entrance., Published as part of Huang, Sunbin, Zhou, Jiajun, Tian, Mingyi & Faille, Arnaud, 2021, Three new species of the subterranean genus Guiodytes from Guangxi, China (Coleoptera: Carabidae: Clivinini), pp. 135-154 in European Journal of Taxonomy 774 on pages 148-152, DOI: 10.5852/ejt.2021.774.1537, http://zenodo.org/record/5567094, {"references":["Tian M. Y. 2014. New records and a new species of the cavernicolous genus Guiodytes Tian, 2013 from Guangxi, China (Coleoptera: Carabidae: Scaritinae). Zootaxa 3861 (4): 355 - 362. https: // doi. org / 10.11646 / zootaxa. 3861.4.5","Tian M. Y. 2013. Occurrence of troglobitic clivinines in China (Insecta: Coleoptera: Carabidae). Journal of Cave and Karst Studies 75 (2): 113 - 120. https: // doi. org / 10.4311 / 2011 LSC 0226"]}

Guiodytes yueliangensis Huang & Tian sp. nov. urn:lsid:zoobank.org:act: 54A7DD47-8EAB-4A9A-9C49-2E6383B4842A Figs 1, 3E, 4E, 5D, 7–8 Diagnosis This new species belongs to the group with distinctly projecting clypeal wings and is close to G. deharvengi Tian, 2014, which also occurs in the same karst area in Huanjiang County, by the similar character configuration of head and elytra, but it is easily separated from the latter species by the missing central pore on the frons of the head and the flattened neck constriction. In addition, the pronotum, with the anterior margin almost not emarginate, is much longer, its median line is much narrower, and the anterior transverse line is finely developed. Etymology The species epithet is derived from Yueliang Shan (Moon Mountain in Chinese), a famous karst landscape with a naturally-formed moon-like cavern passing through it (Fig. 8A). The type locality, Huang Dong, is one of the caves of this landscape. Type material Holotype CHINA • ♂, broken on the left supra-antennal plate; Guangxi, Huanjiang, Shuiyuan, Sancai, Neiwen, Huang Dong; 24°50′05.74″ N, 108°05′1.86″ E; alt. 354 m; 6 Jun. 2017; S. Huang leg.; SCAU. Description Male MEASUREMENTS. Length: 9.3 mm; width: 2.9 mm. Habitus as in Fig. 7. BODY. Well-pigmented, concolorous dark brown. HEAD. Stout (Fig. 3E), from apex of mandible slightly longer than wide, HLm/HW= 1.06, or shorter than wide when measured from apex of labrum, HLl/HW = 0.82; clypeus strongly transverse and moderately emarginate, surface of median part moderately convex, bisetose at base, with flattened clypeofrontal sulcus, clypeal wings fused, divided from supra-antennal plates by distinct notches; supra-antennal plates rounded and well developed, reflexed margined, strongly convex, smooth and glabrous; frons and vertex fairly convex; laterally with two setiferous pores, situated at posterior end of supra-antennal plates and at level of neck constriction, respectively; frontal furrows deep, conspicuously widened, subparallel at middle of frons, divergent posteriorly; frontal carinae blunt but well marked, not parallelsided; eyes completely lacking; genae well developed, anteriorly conically raised laterally then sinuated, sides nearly vertically truncated; neck constriction distinct, relatively wide; labrum transverse, slightly emarginate, slightly wider than clypeus, seven-setose, ciliate laterally; mandibles of moderate size. Palpomeres ensiform, glabrous, apical segments of both maxillary and labial palpomeres much longer than penultimate ones, respectively; labial palpomere two bisetose on inner margin; ligula unisetose at apex; labial suture well marked, deeply and widely furrowed in median portion; mentum well developed, with two pairs of setae, one pair situated beneath mental tooth, posterior one localized in centre of two large, deep concavities restricted at base near lateral margin; median tooth simple, pointed at apex, lateral lobes wide, obliquely truncated; submentum narrow, quadrisetose. Antennae filiform, elongate, reaching over base of pronotum; scapus unisetose subapically, pedicellus smooth and glabrous, pubescent from antennomere three; pedicellus slightly longer than antennomere three, then gradually decreasing in length towards penultimate segment, antennomeres five to ten subelongate, penultimate segment slightly shorter than terminal one. Underside of head rough. THORAX. Pronotum peltate (Fig. 3E), much wider than head, PW/HW=1.25, slightly shorter than wide, PL/PW=0.96; disc strongly convex and with noticeable rugosity; anterior margin unbordered, slightly convex in median portion, margin barely emarginate, anterior transverse line fine and traceable, fore angles protruding; widest slightly behind middle, gently curved and gradually narrowed anteriorly, more evidently contracted towards posterior angles; with distinct teeth at posterior angles, lateral margin between posterior angles and basal constriction with one conspicuous and one minute toothed projections before basal constriction; with two lateral setiferous pores, anterior one at about apical quarter, posterior one at basal angle, just before tooth at posterior angle; reflexed lateral margin nearly smooth, lateral channel with uneven surface, narrower before anterior seta, wider between anterior and posterior lateral setae, interrupted by tooth of posterior angle; basal constriction wide, with noticeable transverse carina; median line deeply furrowed but faint when joined with transverse line in front. Peduncle short, scutellum small. Prosternum and propleura smooth, with dense and isodiametric punctuation. ABDOMEN. Abdominal ventrites also densely punctured; ventrites four to six each with a pair of setae; ventrite seven with two pairs of subapical setae, widely separated at each side. WINGS. Elytra elongate ovate, wider than pronotum, EW/PW= 1.29, much longer than wide, EL/ EW=1.84; strongly convex, widest at middle, gently contracted anteriad and posteriad; base with pair of basal setiferous pores located at beginning of stria one, joined with an additional tubercle at base of interval two; shoulders broadly obtuse, with two teeth on each side; apex pointed; sides distinctly crenulated from base to apical third, then very feebly marked towards apex; elytral striae punctatestriate, narrow and deep, with small and isolated punctures, only striae six and seven ending before reaching basal margin of elytron; intervals distinctly convex; intervals seven and eight joined near base, then joined to interval six at base, intervals six to eight carinated near base; arrangement of elytral setiferous chaetotaxy as in Fig. 4E: five foveolate setiferous pores present on interval three; marginal channel with uninterrupted series of small setiferous pores and several large pores bearing much longer setae. Hind wings reduced. LEGS. Legs moderately elongated; proleg stout, profemur moderately dilated, smooth, with several sparsely distributed setae; protibia well developed, with distinct and complete carina dorsally, sulcus indistinct, quadridentate; lateral teeth blunt at apex, lowest lateral tooth unobtrusive, upper three stoutensiform and moderately protruded anteriorly toward apex; subapical spur elongate-ensiform, blunt at apex, much longer and more slender than uppermost lateral teeth; protarsi slender, tarsomere one very long, much longer than tarsomeres two to four combined; meso- and meta-legs slender, with width of tarsomeres in both narrower than in proleg; mesotibia gradually dilated towards apex, with elongated tuber-like subapical spur, distinctly longer than wide and furnished with isometric seta. GENITALIA (Fig. 5D). Moderately sclerotized; aedeagus similar to that of G. deharvengi Tian, 2014 (Fig. 5A); median lobe strongly arcuated ventrally, elongated and blunt at apex; copulatory piece irregular, elongated, strongly sclerotized in basal and frontal part; parameres asymmetrical, large one with three setae, small one with four setae. Female Unknown. Distribution China (Guangxi: Huanjiang County) (Fig. 1). Known only from Huang Dong cave (Fig. 8B). The cave is still preserved as a natural environment and the entrance opens at the middle of the hill. The cave is not well explored and its length remains unknown. The passages in the cave are complicated, and most of them are moist and wet. The single beetle specimen was collected in a wet place about 100 m from the entrance (Fig. 8C)., Published as part of Huang, Sunbin, Zhou, Jiajun, Tian, Mingyi & Faille, Arnaud, 2021, Three new species of the subterranean genus Guiodytes from Guangxi, China (Coleoptera: Carabidae: Clivinini), pp. 135-154 in European Journal of Taxonomy 774 on pages 144-148, DOI: 10.5852/ejt.2021.774.1537, http://zenodo.org/record/5567094, {"references":["Tian M. Y. 2014. New records and a new species of the cavernicolous genus Guiodytes Tian, 2013 from Guangxi, China (Coleoptera: Carabidae: Scaritinae). Zootaxa 3861 (4): 355 - 362. https: // doi. org / 10.11646 / zootaxa. 3861.4.5"]}

Guiodytes weii Huang & Faille sp. nov. urn:lsid:zoobank.org:act: E0CD76FD-36A6-48D6-BDEE-21A62C3FDABD Figs 1–2, 3D, 4D, 5C, 6 Diagnosis This new species is most similar to G. deharvengi Tian, 2014, which also occurs in Huanjiang County, by the similar character configuration of the head and elytra. It is easily separated from the latter species by the clypeal wings not projecting anteriorly. Moreover, its body shape is much smaller and more slender, the elytral stria punctures are larger and sparser, and intervals four and five are carinated near the base. Etymology This new species is dedicated to Mr. Guofu Wei (Center of World Natural Heritage, Huanjiang) for his support during our biospeleological investigations. Type material Holotype CHINA • ♂; Guangxi, Huanjiang, Jiale, Dapo Dong; 25°06′06.78″ N, 108°31′12.48″ E; alt. 211 m; 5 Dec. 2016; A. Faille leg.; SCAU. Description Male MEASUREMENTS. Length: 4.5 mm; width: 1.1 mm. Habitus as in Fig. 2. BODY. Slightly depigmented, concolorous brown. HEAD. Stout (Fig. 3D), from apex of mandible much longer than wide, HLm/HW=1.41, or slightly longer than wide when measured from apex of labrum, HLl/HW =1.06; distinctly narrower than pronotum, HW/ PW=0.67; clypeus with fused wings transverse, moderately convex medially, bisetose at base, anterior margin slightly bisinuate, bordered, clypeal wings not protruding anteriorly; supra-antennal plates well developed, gently rounded, reflexed, margined, strongly convex, smooth and glabrous; frons and vertex moderately convex, with longitudinal pore at middle; laterally with two setiferous pores, situated at posterior end of supra-antennal plates and at level of neck constriction, respectively; frontal furrows deep, wide, distinctly divergent posteriorly; frontal carinae distinct, slightly convergent to neck constriction; frontoclypeal sulcus not deep but distinct; eyes completely lacking; genae well developed, subparallelsided, sides nearly vertically truncated; neck constriction distinct, slightly stepped; labrum transverse, slightly wider than clypeus, seven-setose, ciliate laterally, straight at anterior margin; mandibles of moderate size. Palpomeres ensiform, glabrous, apical segments of both maxillary and labial palpomeres much longer than penultimate ones, respectively; labial palpomere bisetose on inner margin; ligula unisetose at apex; labial suture well marked, deeply and widely furrowed in median portion; mentum well developed, with two pairs of setae, one pair situated beneath mental tooth, the other at base near lateral margin, and with two large and deep concavities near base; median tooth simple, blunt at apex, lateral lobes wide, gently and obliquely truncated; submentum narrow, quadrisetose. Antennae filiform, rather short, reaching posterior angles of pronotum; scapus unisetose subapically, pedicellus smooth and glabrous, pubescent from antennomere three; pedicellus slightly longer than antennomere three; antennomeres five to ten subelongate, terminal segment slightly longer than penultimate. Underside of head rough. THORAX. Pronotum peltate (Fig. 3D), much wider than head, slightly longer than wide, PL/PW=1.06; disc smooth, moderately convex; anterior margin slightly concave, beaded in median line; fore angles slightly protruding; widest at beginning of posterior third, gently and gradually narrowed anteriorly, strongly contracted towards posterior angles; posterior angles with obtuse teeth, lateral margin between posterior angles and basal constriction with two conspicuously toothed projections; with two pairs of lateral setiferous pores, anterior one at about anterior quarter, posterior one at basal angle and distinctly removed from channel; reflexed lateral margin with slight notches, lateral channel narrow before anterior seta, distinctly widened between anterior and posterior lateral setae, ending before posterior seta; basal constriction wide, basal carina narrow; median line engraved, deep, wide, distinctly joining basal constriction, surpassing anterior transverse line without joining. Peduncle short, scutellum small. Prosternum and propleura smooth, with dense and isodiametric abdominal punctuation. ABDOMEN. Ventrites also densely punctured, ventrites four to six each with a pair of setae; ventrite seven with two pairs of subapical setae, widely separated at each side. WINGS. Elytra elongate ovate, wider than pronotum, EW/PW= 1.27, much longer than wide, EL/ EW=1.86; strongly convex; widest behind middle, gently contracted anteriad and posteriad; base finely bisinuate, with a pair of additional tubercles followed by a basal setiferous puncture located at base of interval two; shoulders broadly obtuse, with sharp tooth; apex of elytra pointed; sides distinctly crenulated from base to apical quarter; elytral striae punctate-striate, wide and deep, with large and isolated punctures, only striae six and seven ending before reaching basal margin of elytron; intervals distinctly convex; intervals one to four unbordered at base; intervals seven and eight joined near base, then joined to interval six at base, intervals six to eight carinated throughout, intervals four and five carinated near base; arrangement of elytral setiferous chaetotaxy as in Fig. 4D, five foveolate setiferous pores on interval three; marginal channel with uninterrupted series of small setiferous pores and several large pores bearing much longer setae. Hind wings reduced. LEGS. Moderately elongated; proleg stout, profemur distinctly dilated, smooth, with a long seta and two shorter ones; protibia well developed, with distinct and complete carina dorsally, sulcus indistinct, quadridentate; lateral teeth blunt at apex, lowest lateral one much shorter than others, upper two stoutensiform; subapical spur elongate-ensiform, blunt at apex, shorter and more slender than uppermost lateral teeth; protarsi slender, tarsomere one longer than tarsomeres two to four combined; meso- and meta-legs slender, with width of tarsomeres in both narrower than in proleg; mesotibia gradually dilated towards apex, with an elongated, tuber-like subapical spur, longer than wide and furnished with an isometric seta. GENITALIA (Fig. 5C). Moderately sclerotized; aedeagus similar to those of G. deharvengi Tian, 2014 (Fig. 5A) and G. cavicola Tian, 2013 (Fig. 5B), median lobe gently arcuated ventrally, whereas strongly arcuated in G. deharvengi, or evidently bisinuate in G. cavicola, blunt at apex; parameres asymmetrical, one much longer and broader than the other, both parameres with three long setae at apex. Female Unknown. Distribution China (Guangxi: Huanjiang County) (Fig. 1). Known only from Dapo Dong cave. This cave opens at the bottom of a hill near a country road in the village of Jiale. The entrance is narrow, but accessible (Fig. 6A). It is about 90 m long with a short and narrow side passage inside. A large part of the passage is dry, but there are some moist places. The single blind beetle specimen was discovered on the moist wall about 30 m from the entrance at the left side of the main passage. Other syntopic cave animals were observed during the investigation in the cave, for instance, a flatworm and a bat.(Fig. 6B, D)., Published as part of Huang, Sunbin, Zhou, Jiajun, Tian, Mingyi & Faille, Arnaud, 2021, Three new species of the subterranean genus Guiodytes from Guangxi, China (Coleoptera: Carabidae: Clivinini), pp. 135-154 in European Journal of Taxonomy 774 on pages 137-144, DOI: 10.5852/ejt.2021.774.1537, http://zenodo.org/record/5567094, {"references":["Tian M. Y. 2014. New records and a new species of the cavernicolous genus Guiodytes Tian, 2013 from Guangxi, China (Coleoptera: Carabidae: Scaritinae). Zootaxa 3861 (4): 355 - 362. https: // doi. org / 10.11646 / zootaxa. 3861.4.5","Tian M. Y. 2013. Occurrence of troglobitic clivinines in China (Insecta: Coleoptera: Carabidae). Journal of Cave and Karst Studies 75 (2): 113 - 120. https: // doi. org / 10.4311 / 2011 LSC 0226"]}

Satotrechus rieae U��no, 2006 U��no, 2006: 6 Tian & Huang, 2018: 246 Material examined. 3 females, from deep area of -330 to - 450 m inside the cave Luoshui Dong, Xianheping, Anlong Xian (County), Qianxinan Miao & Buyi Zizhizhou (Autonomous Prefecture), southwest Guizhou, 105��35���31.42������E / 24��59���16.11������N, 1163 m, 2020-XII-06, leg. Huanghe Zhou (You Cha), in SCAU; 1 male and 1 female, Cave Da Dong, Yangfan, Rongdu, Ceheng, Qianxinan Miao & Buyi Zizhizhou, southwest Guizhou, 105��39���40���E / 25��2���31��� N, 1190 m, 2015-VI-20, Mingyi Tian, Weixin Liu, Xinhui Wang and Mingruo Tang leg. Distribution: China (Guizhou). Known from four caves in Anlong: Xiniu Dong, Xianren Dong, Rongnei Dong (U��no, 2006) and Luoshui Dong and Da Dong in Ceheng (Tian & Huang, 2018)., Published as part of Tian, Mingyi & Huang, Sunbin, 2021, Discovery of a new cavernicolous trechine genus and species from a deep pit in Anlong, southwestern Guizhou Province (Coleoptera: Carabidae: Trechinae), pp. 194-202 in Zootaxa 4985 (2) on page 201, DOI: 10.11646/zootaxa.4985.2.3, http://zenodo.org/record/4943223, {"references":["Ueno, S. I. (2006) Cave trechines from southwestern Guizhou, South China, with notes on some taxa of the Guizhaphaenops complex (Coleoptera, Trechinae). Journal of the Speleological Society of Japan, 31, 1 - 27."]}

Ckacus n. gen. (Chinese name: �����������ffl��) Type species: Ckacus youcha n. sp. (Luoshui Dong cave, Xianheping, Anlong, Qianxinan, Guizhou) Generic characteristics. Medium-sized for cavernicolous trechine beetles, semi-aphaenopsian wholly pubescent, eyeless and depigmented; body rather thin, elongate, with moderate slender appendages. Head strongly elongate; genae nearly parallel-sided; two pairs of supra-orbital setiferous pores present; frontal furrows short and reduced posteriorly; vertex moderately convex; right mandibular tooth tridentate though median one reduced; labial suture completely disappeared; mentum bisetose, base largely and deeply concave; submentum with a row of 12-setose; antennae moderately thin, not extending over apices of elytra. Propleura invisible from above; pronotum quadrate, slightly longer than wide, presence of two pairs of latero-marginal setae, both fore and hind angles sharpened. Elytra elongated ovate, with a distinct but rounded humeral angle on each side; slightly longer than fore body including mandibles; lateral margins ciliate throughout; disc strongly convex, punctation of striae noticeable, intervals convex, the 1 st intervals very narrowed in apical 1/3; two pairs of dorsal setiferous pores present on the 3 rd stria, preapical pores present; the 4 th pore of marginal umbilicate series far from the 3 rd, 5 th and 6 th pores close to each other. The 1 st and 2 nd protarsomeres modified in male, slightly widened and distinctly denticulate inwardly. Ventrite VII with one pair of apical setae in male. Male genitalia thin and elongate, moderately sclerotized. Remarks. Ckacus looks like Bathytrechus U��no, 2005, which was recorded from the cave Tiankeng Dong in Leye, northwestern most of Guangxi, in the medium and elongate body which is wholly pubescent, the tridentate right mandible, sharpened hind angles of pronotum, and entirely striate elytra with the first intervals extremely narrowed at the apical third of elytra. However, it differs from the latter genus in many characters, such as: (1) Mentum and submentum completely fused and submentum 12-setose, versus labial suture traceable and submentum only 6-setose in Bathytrechus; (2) Frontal furrows distinctly reduced posteriorly, versus entire in Bathytrechus; (3) 1 st and 2 nd protarsomeres modified in male, versus not modified in Bathytrechus; (4) the middle group of the marginal umbilicate pores close to each other, versus widely spaced in Bathytrechus; and (5) apical striole of elytra absent, versus present in Bathytrechus. In addition, male genitalia is much more elongate, with a sharp apical lobe in Ckacus, whereas shorter and apical lobe rod-like in Bathytrechus. Etymology. The generic name is derived from the abbreviations of ��� China Karst Cave Union��� (���������Dz������ �����Dz). Gender masculine. Generic range. China (Guizhou)., Published as part of Tian, Mingyi & Huang, Sunbin, 2021, Discovery of a new cavernicolous trechine genus and species from a deep pit in Anlong, southwestern Guizhou Province (Coleoptera: Carabidae: Trechinae), pp. 194-202 in Zootaxa 4985 (2) on page 196, DOI: 10.11646/zootaxa.4985.2.3, http://zenodo.org/record/4943223, {"references":["Ueno, S. I. (2005) A new genus and species of cave trechine (Coleoptera, Trechinae) from a deep pothole in northwestern Guangxi, South China. Journal of the Speleological Society of Japan, 29, 1 - 11."]}

Ckacus youcha n. sp. (Chinese name: ����������������ffl) (Figs. 2���5) Type material. Holotype male, Luoshui Dong cave, Xianheping, Anlong Xian (County), Qianxinan Miao & Buyi Zizhizhou (Autonomous Prefecture), southwest Guizhou, 105��35���31.42������E, 24��59���16.11������N, 1163 m, 2020-XII-06, leg. Huanghe Zhou (���You Cha���), in SCAU. Diagnosis. A medium-sized semi-aphaenopsian trechine species, wholly pubescent, with moderately elongated body and thin appendages. Description. Length: 7.0 mm, width: 2.0 mm. Habitus as in Fig. 2. Body yellowish-brown, but palps and tarsi yellow; wholly covered with long setae, moderately shining, underside of head with a few setae, thorax glabrous ventrally but prosternum with several setae, abdominal ventrites shortly and densely pubescent. Macrosculpture: transversely meshed on head, densely and transversely striate on pronotum and elytra. Head much longer than wide, HLm/HW = 2.1, HLl/HW = 1.6; widest at about middle of head excluding mandibles, neck constriction well-marked; frons and vertex moderately convex; frontal furrows shallow and short, ended at about middle of head; anterior and posterior supraorbital pores located at middle and basal 1/4 of head respectively; clypeus 6-setose; labrum transverse, frontal margin straight, 6-setose; mentum bisetose on either side of tooth base, tooth moderately long, unified at tip; ligula thick and short, 8-setose at apex, inner two much longer than other; palps thin and elongate, all glabrous but bisetose on inner margin of 2 nd labial palpomere and two additional setae at outer margin medially and subapically, penultimate palpomere longer than the apical one in labium and maxillaries (cf. 1.2 times); suborbital pores intermedially sited; antennae slender, 1 st antennomere with several cilia then densely pubescent from the 2 nd antennomere, 1 st stouter than others, as long as 2 nd, 3 rd the longest, relative length of each antennomere as follows: the 1 st (1.0), 2 nd (1.0), 3 rd (1.9), 4 th (1.8), 5 th (1.7), 6 th (1.7), 7 th (1.5), 8 th (1.5), 9 th (1.3, 10 th (1.1) and 11 th (1.5). Propleura invisible from above. Pronotum slightly longer than wide, PnL /PnW = 1.1, shorter than head excluding mandibles, PL/HLl = 0.8; lateral margins finely bordered throughout; widest at about 1/3 from front, gently contracted forwards and backwards, contracted and nearly straight near hind angles which are acute; fore angles slightly protruded, nearly acutangular; base faintly bisinuate, front nearly straight, both unbordered, front slightly wider than base, PfW/PbW = 1.2; anterior and posterior latero-marginal setae at 5/6 from base and just before hind angles respectively; disc moderately convex, mid-line distinct. Scutellum small and narrow. Elytra slightly longer than fore body including mandibles, much longer than wide, EL/EW = 1.7, twice as wide as pronotum; base unbordered, lateral margins finely ciliate throughout, nearly obliquely truncate at humeral portions, humeral angles broad, widest a little behind middle of elytra; disc strongly convex; basal pore present at sides of scutellum, anterior and posterior dorsal pores on the 3 rd stria at basal 1/4 and middle of elytra respectively, preapical pore at exactly the anastomotic point between the 2 nd and 3 rd striae, closer to elytral suture than to apical margin; locations of umbilicate marginal pores as in Fig. 3A. Legs densely pubescent; 1 st and 2 nd protarsomeres slightly widened in male, shortly and bluntly denticulate at inner apex; 1 st tarsomere much shorter than 2 nd ���4 th combined in fore legs, whereas as long as in middle and hind legs; tibiae without longitudinal sulci. Each abdominal ventrites V-VI bisetose paramedially, VII bisetose in male. Male genitalia (Fig. 3B, C): The median lobe of aedeagus medium-sized, quite elongate, gently arcuate towards apex which is sharp; basal opening quite small, with a large and almost rounded sagittal aileron; inner sac armed with a long copulatory piece, which is about 1/4 as long as aedeagus; in dorsal view, apical lobe thin, much longer than wide, broadly rounded at apex; parameres well-developed, but much shorter than median lobe, each paramere with four long setae at apex. Etymology. Dedicated to ���You Cha���, a nickname of Ms. Huanghe Zhou, an active member of Guilin Cave Exploration Team, Guilin. Distribution. China (Guizhou). Known only from the limestone cave Luoshui Dong, sympatric with Satotrechus rieae U��no, 2006. Luoshui Dong is located within Xianheping Forest Park. This vertical pothole is 515 m deep, one of the deepest caves in China (Figs. 4, 5A, B). There is a lot of debris in the muddy terrace of about 400 m below the entrance. The specimens sampled, as well as many other Trechini, observed wandering on the ground and walls between - 330 m to - 450 m (Fig. 4). Apart from beetle species, other animals living inside the cave were cricket Tachycines (Gymnaeta) sp., millipedes of the genera Glyphiulus and Paracortina, harvestmen, bats, frog Oreolalax rhodostigmatus Hu & Fei, 1979 and crab Diyutamon cereum Huang et al., 2017 (Fig. 5 C-E)., Published as part of Tian, Mingyi & Huang, Sunbin, 2021, Discovery of a new cavernicolous trechine genus and species from a deep pit in Anlong, southwestern Guizhou Province (Coleoptera: Carabidae: Trechinae), pp. 194-202 in Zootaxa 4985 (2) on pages 196-201, DOI: 10.11646/zootaxa.4985.2.3, http://zenodo.org/record/4943223, {"references":["Ueno, S. I. (2006) Cave trechines from southwestern Guizhou, South China, with notes on some taxa of the Guizhaphaenops complex (Coleoptera, Trechinae). Journal of the Speleological Society of Japan, 31, 1 - 27."]}