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A new species Chinaocerus dentaedeagus sp. nov. is described and illustrated from Yunnan, China. The new species can be distinguished from other species of the genus Chinaocerus by aedeagal shaft subapex with pair of dentate lamellar. Meanwhile, a checklist of the genus and a key to the genera from China are provided.

Chinaocerus Zhang & Li, 2016 Type species. Chinaocerus bispinatus Zhang & Li, 2016. Description. Coloration. Body light brown to yellowish brown. Vertex yellowish brown with pair of black spots near dorsal margin of face. Pronotum with pair of triangular black marks on anterior margin. Mesonotum with basal black to dark brown trangular marks, a round spot on either side of median line. Forewing grey brown, veins dark brown. Medium-sized. Head obviously wider than pronotum, anterior margin of crown convexly round, anterior and posterior margins nearly parallel in dorsal view. Ocelli small, situated near ends of lateral frontal sutures, and closer to eyes than to each other. Face slightly wider across eyes than long, gena with almost straight lateral margins; frontoclypeus broad; anteclypeus broadened apically, longer than wide, slightly surpassing apex of genae, and lateral margins slightly concave; lorum slightly narrower to slightly wider than anteclypeus. Pronotum relatively short and broad, anterior margin convexly rounded, posterior margin slightly concave. Exposed part of mesonotum and scutellum nearly triangular, slightly longer than pronotum. Forewing narrow and long, with 4 apical cells and 3 subapical cells, appendix medially broad, veins obviously. Hind femur with 2+0 macrosetae, hind tibial macrosetae PD 14–17, AD 5–6, AV 7–8, hind basitarsus with three platellae on distal transverse row. Male genitalia. Male pygofer elongate, processes absent, ventral margin with denticles, anal tube processes narrow and elongate. Subgenital plate narrow and elongate, approximately as long as pygofer, with dense fine setae on dorsal and ventral margin. Style well-developed and curved dorsally, with slender setae on lateral surface apically. Connective five-lobed with medial longitudinal keel. Aedeagus with prominent basal apodeme expanded laterad, aedeagal shaft elongate, nearly straight in lateral view, with one or more pairs of lateral subapical processes and usually with dorsolateral lamella; gonopore near apex of shaft on posterior surface. Female genitalia. Ovipositor slender and strongly projecting beyond pygofer, posterior margin of seventh sternite convexly rounded, second valvula with numerous small teeth along dorsal margin. Distribution. China (Sichuan, Yunnan, Qinghai, Gansu). Remark. Chinacerus is similar to Idiocerus Lewis in size, coloration, wing venation and male genitalia, but Chinaocerus differs in having the male pygofer ventral margin with denticles, aedeagal shaft with pair of lateral processes at subapex and usually with dorsolateral lamellae, and the female second valvulae elongate and slender. Checklist of Chinacerus species from China Chinacerus bispinatus Zhang & Li Chinacerus bispinatus Zhang & Li, 2016: 237, figs 1–2, 5–6, 11–20. Distribution: China (Yunnan). Chinacerus dentaedeagus sp. nov. Distribution: China (Yunnan). Chinacerus dentatus Zhang Chinacerus dentatus Zhang & Li, 2022: 447, figs 1–4, 5–6, 7, 8–17. Distribution: China (Qinghai, Gansu). Chinacerus kangdingensis Zhang & Li Chinacerus kangdingensis Zhang & Li, 2016: 240, figs 3–4, 7–8, 21–31. Distribution: China (Sichuan). Chinacerus sexspinosus Zhang & Webb Chinacerus sexspinosus Zhang & Webb, 2018: 585, figs 3–4, 7–8, 19–28. Distribution: China (Yunnan). Chinacerus shii Zhang & Li Chinacerus shii Zhang & Li, 2016: 240, figs 9–10, 32–41. Distribution: China (Sichuan). Chinacerus tubulatus Zhang & Webb Chinacerus tubulatus Zhang & Webb, 2018: 584, figs 1–2, 5–6, 9–18. Distribution: China (Yunnan). Key to species of Chinacerus (males) from China Figs 1–12 1 Aedeagal shaft with dentate lateral preapical lamella (Fig. 20)............................... C. dentaedeagus sp. nov. - Aedeagal shaft with lateral margins smooth................................................................. 2 2 Aedeagal shaft tubular, and evently curved dorsally in lateral (Figs.1–2)................................. C. tubulatus - Aedeagal shaft sinuate in lateral view, compressed........................................................... 3 3 Aedeagal shaft with three pairs of processes (Figs. 3–4)........................................... C. sexspinosus - Aedeagal shaft with fewer than three pairs of processes....................................................... 4 4 Aedeagal shaft with pair of processes at apex............................................................... 5 - Aedeagal shaft with two pairs of processes at subapex........................................................ 6 5 Aedeagal shaft with pair of small spine-like processes (Figs. 5–6).................................. C. kangdingensis - Aedeagal shaft with pair of very short spine-like processes (Figs. 7–8)................................... C. dentatus 6 Aedeagal shaft with pair of extremely small spine-like processes (Figs. 9–10)........................... C. bispinatus - Aedeagal shaft without pair of extremely small spine-like processes (Figs. 11–12).............................. C. shii

Chinaocerus dentaedeagus sp. nov. Figs 13–21 Description. Body length (including tegmina): male, 5.0– 5.2 mm, female, 5.4–5.5 mm. Coloration. General color yellow green. Crown (Figs. 13, 15) anterior margin with pair of distinct but small black spots, eyes (Figs. 13, 15) brown, ocelli (Figs. 13, 15) black. Face (Fig. 15) dull yellow. Pronotum (Fig. 13) olive green, anterior triangles small. Mesonotum (Fig. 13) yellow, anterior triangles black, pair of small round discal spots anterad of scutellar suture. Forewings (Fig. 13) brown, veins dark brown. Legs (Fig. 14) yellow. Male dorsal basal abdominal apodemes (Fig. 16) shorter than ventral ones and attaining posterior margin of sternite III. Male genitalia. Pygofer (Fig. 17) with posteroventral margin obtusely emarginate, apex acutely angulate in lateral view. Anal tube processes moderately slender and nearly straight, extended 2/3 distance to pygofer apex. Subgenital plate (Fig. 17) narrow and elongate, with long fine setae on apical margin. Connective (Fig. 18) Yshaped, with long stem. Style (Fig. 19) curved dorsally with acute indentation just distad of lateral lobe, with few short apical setae in lateral view. Aedeagus shaft (Figs. 20, 21) straight for most of length in lateral view, expanded distally in posterior view with laterall lamella finely dentate, apex acute in lateral and posterior view, with one pair of slender lateral preapical processes extended ventrolaterad to basal half of shaft. Measurements (mm). Male: body length 5.0–5.2, face length 1.1–1.2, width 1.3–1.4; distance between ocelli 0.70–0.80; distance fromcellus to eyes 0.20–0.30; medial length of pronotum 0.50–0.55, width 0.80–0.85; scutellum length 0.80–0.85, width 0.70–0.75. Type material. Holotype, ♂, Xinping County, Mt. Ailao, Yunnan Province, China (101° 30′ 34″ E, 23° 58′ 06″ N; H: 2071 m), 4–5 June 2019, coll. Xianyi Wang & Qin Zuo. Paratypes, 2♂♂, Pingbian County, Mt. Daweishan, Yunnan Province, China. (101° 41′ 18″ E, 22° 59′ 12″ N; H: 1500 m), 14–16 June 2019, coll. Xianyi Wang & Jiajia Wang. 2♂♂, Yingjiang County, Yunnan Province, China (97° 39′ 56″ E, 24° 35′ 57″ N; H: 1385 m), 30 May 2019, coll. Xiaoling Zhou & Chao Zhang. 1♂, Lvchun County, Mt. Huanglianshan, Yunnan Province, China. (102° 17′ 27″ E, 22° 56′ 03″ N; H: 1815 m), 8–9 June 2019, coll. Jiajia Wang & Chao Zhang. (No. IDW20017). Remarks. The new species is similar to C. shii, but it can be distinguished from the latter by the serrate lateral margins and single pair of elongate lateral processes of the aedeagus. Etymology. The new species name is derived from the words “ dent- ” and “ aedeagus ”, referring to the aedeagus subapex with dentate lamellar. Distribution. China (Yunnan province). (Fig. 22).