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有剣ハチ類（セイボウ上科，スズメバチ上科，ミツバチ上科の総称）は花粉媒介や食物網の制御，天敵防除などの生態系機能を持っている重要な生物である。種の分布情報は，気候や環境の変動による有剣ハチ類相の変化を把握するための基盤情報として重要である。しかし，九州における有剣ハチ類の分布情報は乏しく，比較的調査されている鹿児島県でも記録されている分類群は偏りがある。本調査では，鹿児島大学農学部附属高隈演習林および大隅国有林において，有剣ハチ類の分布を記録し，種リストを作成した。異なる季節にイエローパントラップを用いて有剣ハチ類を採集したところ，494個体67種が採集され，その内5種が九州初記録種であった。ショウキアリガタバチのような，低地の照葉樹林でのみ出現する種が得られており，低地の照葉樹林での調査が九州の有剣ハチ類相の解明に貢献できると考えられる。, Aculeata bees and wasps（Chrysidoidea, Vespoidea, and Apoidea）play important roles in ecosystem functions such as pollination, food web control, and natural enemy control. Information on their distribution is needed to understand the changes in Aculeata fauna, especially due to climatic and environmental changes. The Aculeata fauna of Kyushu is poorly surveyed, and recorded taxa are biased even in Kagoshima Prefecture, where surveys have been relatively conducted well. In this study, we provided the occurrence data of Aculeata in the Takakuma Experimental Forest, Kagoshima University, and the Osumi National Forest. We collected Aculeata in different seasons using yellow pan traps and identified a total of 494 individuals belonging to 67 species, 5 of which were recorded from Kyushu for the first time. Species that appear to be unique to lowland broad-leaved forests were obtained（e. g. Epyris shohki）．Surveys at these lowland forests could contribute to a better understanding of the Aculeata fauna of Kyushu.

In social vespine wasps, the nest characteristics and associates vary intra- and interspecifically. I studied the nest characteristics and nest associates of three Dolichovespula wasp species in boreal Finland. The average number of combs and cells per nest was similar among D. media, D. saxonica and D. norwegica, and similar to Dolichovespula in the temperate zone. Most D. media and D. saxonica colonies produced both gynes and males, whereas D. norwegica produced mainly either one. The average colony lifespan of D. saxonica was a bit over two months, i.e. shorter than documented for Dolichovespula in the temperate zone. The proportion of nests parasitised by the ichneumonid wasp Sphecophaga vesparum was 36% in D. saxonica and 50% in D. media; S. vesparum has not been recorded from D. media before. The proportion of parasitized cells was 0.6–11% for D. saxonica and 0.2–22% for D. media. The proportion yellow, overwintering cocoons of S. vesparum was highly variable among the nests. The proportion of nests parasitised by the moth Aphomia sociella was 36% in D. saxonica and 13% in D. media. Sphecophaga and Aphomia were not recorded from D. norwegica colonies, which supports studies in the temperate zone. The study adds up to the previous research on the nest structure and nest associates of vespines, and together they indicate that there is geographical variation within Europe and globally in the host use of Sphecophaga.

Lasius maltaeus Seifert, 2020 was recently described as a Maltese endemic ant based on quantitative morphology, after decades of uncertainties over the identity of the local population, which has a phenotype resembling L. emarginatus (Olivier, 1791). At the same time, Sicilian L. emarginatus populations were discovered to diverge in their mitochondrial DNA to a degree that suggested heterospecificity. Considering the biogeographic similarity of Malta and Sicily, with land bridges connecting them repeatedly until the last glacial maximum, we questioned the assumption that L. maltaeus was endemic to Malta. We integrated quantitative morphology and mtDNA in the study of the Maltese and southern Italian populations phenotypically close to L. emarginatus. We discovered that the range of L. maltaeus extends over most of Sicily, while the true L. emarginatus replace it in the north-eastern sector of the island, the nearby Aeolian Islands, and the Italian peninsula. The distributions of L. emarginatus and L. maltaeus in Sicily follow biogeographic patterns recalling the island’s complex paleogeographic history. Further investigations should verify the existence of truly Maltese endemic ants, since the status of other allegedly endemic species is not strongly supported.

The first record of the Asian/yellow-legged hornet (Vespa velutina) in Ireland was reported in April 2021, when a single female individual was discovered in Dublin. Vespa velutina has been present in mainland Europe since 2004 and in the UK since 2016 and poses an enormous threat to European apiculture and bee-mediated pollination services. Three mitochondrial genes were sequenced from the Irish specimen to determine whether the specimen originated from the established European population or signified a new point of entry from its native range in China. Additionally, specimens from Portugal, Spain, France, Germany, and the Channel Islands were sequenced at these three genes to build on previous studies which have asserted, based solely on Cytochrome Oxidase 1 (COI) analysis, that the entire range of V. velutina in Europe represents a single invasion which has proliferated since the first record in France. Further data were retrieved from GenBank for comparison. Results reveal that the mtDNA lineage observed in Dublin is the same as that seen throughout Europe, and therefore the arrival of this species in Ireland likely represents a further spread of the ongoing European invasion.

Three new species of velvet ants known from females are here described: Mickelomyrme leleji Sittichaya & Williams, sp. nov., Nordeniella dokbua Sittichaya & Williams, sp. nov., and Smicromyrme songkhwae Sittichaya & Williams, sp. nov. One additional species is newly recorded from Thailand: Bischoffitilla selangorensis (Pagden). Synoptic list of Mutillidae in Thailand Natural History Museum with new records is given.

Species of the potter wasp genus Allorhynchium van der Vecht (Eumeninae: Odynerini) occurring in Vietnam are presented. Seven species have been recorded from Vietnam. Of them, three species are described as new to science: Allorhynchium latum Nguyen, Tran & MT Nguyen, sp. nov., A. moerum Nguyen & AD Nguyen, sp. nov., and A. setosum Nguyen & Engel, sp. nov., and one species, A. argentatum (Fabricius, 1804), is recorded from Vietnam for the first time. An updated key to the Oriental species of the genus is presented.

Several phragmotic species in the ant genus Carebara Westwood, 1840 with a cephalic shield are known from the Old World, but species with an anteriorly truncated head seem to be unknown until now. A new species, resembling the phragmotic workers of the ant genus Colobopsis, is here described as Carebara colobopsis Hosoishi & Yamane, sp. nov., based on major and minor worker found in Cambodia. This new species is similar to Carebara acutispina (Xu) and C. obtusidenta (Xu) in some important characters, but distinguished from the latter two by distinct metanotum and deep groove in front of metanotal disc in the major worker, and longer head and deep metanotal groove in the minor worker. This is the first confirmed record of a truncated phragmotic head in the major worker of the genus Carebara. We propose the Carebara acutispina species group to include all the three species, present a diagnosis of this group, and provide a key to species based on the major and minor worker castes.

The eumenine fauna of the Maltese Islands is reviewed and 17 species are asserted as occurring in the mentioned territory. Of these, Parodontodynerus ephippium and Stenodynerus fastidiosissimus are recorded for the first time from the Maltese archipelago. An annotated species list and a key to species are provided. Three doubtful records are also discussed., peer-reviewed

There are only two Aphaenogaster species from the subterranea group in the western Mediterranean: A. ichnusa Santschi, 1925, from south-western Europe, and A. subterranea (Latreille, 1798), also occurring in central and eastern Europe. Historically, the two species have been widely misunderstood: A. ichnusa was long considered a Sardinian endemic subspecies of A. subterranea, while its continental populations were misidentified as A. subterranea s. str. Recently, A. ichnusa was elevated to species rank and its worker caste was redescribed with that of A. subterranea, allowing for their correct identification. Yet their distribution was documented in detail only for France and Sardinia. Furthermore, no morphological characters were described to distinguish the males and queens of the two species. By investigating private and museum collections, 276 new records of A. ichnusa are provided here and 154 of A. subterranea from the western Mediterranean. Additionally, qualitative and quantitative morphological characters were combined to identify their males and queens. We present the new southernmost, easternmost, and westernmost distribution limits for A. ichnusa. Based on our results, this species is widely distributed in Italy and Catalonia (Spain), also occurring on several Mediterranean islands, avoiding areas with continental climate and high altitudes. Sicily is the only island to host the less thermophilous A. subterranea, which otherwise extends westward to Galicia (Spain). Sympatric occurrence is not rare along the contact zone. Additional natural history observations are reported regarding foraging habits, associated myrmecophiles, habitat preferences, and colony structure in the two species.

We describe a new pair of trophobiotic partners from the ant genus Acropyga and the root mealybug genus Neochavesia. A recent field study on Acropyga ants and associated root mealybugs, conducted in the Peruvian Amazon, led to the discovery of Acropyga manuense LaPolla & Schneider, sp. nov. and its root mealybug symbiont Neochavesia podexuta Schneider & LaPolla, sp. nov. The new root mealybug belongs to the family Xenococcidae, whose members are all obligate associates of Acropyga ants. Providing joint descriptions of new mutualist partners in the same article is a novel approach for this system, and it offers benefits to the ongoing study of mutualism and patterns of association among these symbiotic ants and scales. Here, we also begin to revise the species-group composition of Acropyga by establishing the smithii species-group, and we provide updated information to aid in identifying the new ant species and root mealybug species.

Vespa mandarinia Smith 1852 is a semi-specialized predator of other social Hymenoptera and one of the two largest species of Vespa. Several individuals of this predatory wasp were detected in Canada and the United States in 2019, including an entire nest that was located and destroyed on Vancouver Island, British Columbia. The Washington State Department of Agriculture and the United States Department of Agriculture’s Animal and Plant Health Inspection Service have collaborated to survey Washington State for V. mandarinia since 2020, using traps staffed by agency personnel, collaborators from local governments and nongovernmental organizations, and the general public. Trap data and public reports were used to select sites for live-trapping or net surveys, and live hornets captured in these efforts were subsequently collected and fitted with radio tags to locate nests. The survey ultimately led to the discovery of a V. mandarinia nest in October 2020, and three nests in August and September 2021. All of the nests were located within in red alder trees (Alnus rubra), with one just above the ground in a standing dead tree, and the other three in cavities ~2 to 5 meters above the ground in living trees. The number of combs in each nest varied between four and ten, cells between 418 and 1,329, and total hornets per nest between 449 and 1,474 (including immature and mature stages). Together, the four nests indicate an incipient population of V. mandarinia in the Cascadia region, and ongoing action by local, state, provincial, and federal governments, and residents of both countries is required to avoid the establishment of this exotic species in the region.

A newly discovered species, Subancistrocerus clypeatussp. nov., from China (Zhejiang) is described and illustrated. In addition, Subancistrocerus kankauensis (Schulthess-Rechberg) is redescribed and photographed after studying the type series. A key to the genus Subancistrocerus de Saussure, 1855 from China is presented. The distribution of this genus is briefly discussed.

The family Formicidae is composed of ants that organize themselves into castes in which every individual has a joint organizational function. Solenopsis Westwood, 1840 is an ant genus with opportunistic and aggressive characteristics, known for being invasive species and stings that cause burning in humans. This genus is particularly difficult to classify and identify since its morphology provides few indications for species differentiation. For this, a tool that has been useful for evolutionary and taxonomic studies is cytogenetics. Here, we cytogenetically studied Solenopsis saevissima Smith, 1855 from Ouro Preto, Minas Gerais, Brazil. We evaluated the occurrence of polyploid cells in individuals and colonies by conventional cytogenetics. A total of 450 metaphases were analyzed and counted. Chromosome counts of individuals and colonies showed varied numbers of ploidies, from n = 16 to 8n = 128. The karyomorphometrical approach allowed determination of the following karyotypes: n = 10 m + 4 sm + 2 st, 2n = 20 m + 8 sm + 4 st, and 4n = 40 m + 16 sm + 8 st. Polyploidy can be found naturally in individuals and colonies and may represent an adaptative trait related to widespread distribution and invasion ability of new habitats.

In the context of global insect decline, the urbanisation process plays a key role. However, urban pavements, which are considered to be impervious to biodiversity, can harbour ground-nesting insects under certain conditions. Recent observations have revealed the presence of Formicidae nests under urban pavements. The aim of this work is to determine the species richness of Formicidae nesting under urban pavements in the Brussels-Capital Region (Belgium) and to characterise their nest environment and soil texture. Seven ant species were identified in 120 nesting sites: Lasius niger, Lasius brunneus, Lasius flavus, Lasius fuliginosus, Tetramorium caespitum, Tetramorium impurum and Myrmica rugulosa. Concrete slabs or natural stones with a sandy sub-layer are the main structures in which ants nest. In addition, nests were mainly found under modular pavements with degraded rigid joints. The results of this work highlight the capacity of urban structures to host part of ant biodiversity in cities.

The European species of the potter wasp genus Eumenes Latreille, 1802 (Vespidae, Eumeninae) are illustrated and a new illustrated key to the 13 recognised species is presented. Eumenes mediterraneus aemilianus Guiglia, 1951 is synonymised with E. papillarius (Christ, 1791) (syn. nov.), E. obscurus André, 1884 and E. andrei Dalla Torre, 1894 with E. pedunculatus (Panzer, 1799) (syn. nov.) and E. crimensis Blüthgen, 1938 with E. sareptanus André, 1884 (syn. nov.).

The genus Linepithema was erected by Mayr (1866) for his male-based species L. fuscum. In this study a new species is described also based on male morphology, L. paulistanasp. nov., collected in the city of São Paulo, Brazil, which is attributed to the fuscum group (Formicidae: Dolichoderinae). Linepithema paulistanasp. nov. is the only species of fuscum group present in the eastern part of South America. It is easily distinguishable from the other species of the group because of the presence of a triangular volsellar tooth, which is distally situated between the digitus and the basivolsellar process. By using SEM and optical microscopy, the external genitalia of L. paulistanasp. nov. were analyzed and illustrated and some characters and previous interpretations have been re-evaluated in the Linepithema fuscum group. The male external genitalia are also comparatively analyzed in three species representative of the three Linepithema species groups, those of fuscum, humile, and neotropicum. The present work confirms that the morphological characters of male ants, especially those of male external genitalia, are effective for the identification of genera or species. Given the discrete morphological differences between the external genitalia of the fuscum group and the other species of this genus, a re-evaluation of the generic status of Linepithema is suggested.

A new species, Ropalidia daklak Bui, Mai & Nguyen, sp. nov., belonging to the plebeja-group of the genus Ropalidia Guérin-Méneville, 1831 is described and figured based on females and males from Vietnam. The nest structure of the new species is described, and an updated key is provided to all known species of the group.

Some Azteca ants are well-known symbionts that defend their Cecropia host plants against herbivory, although there is considerable variability in behavior among colonies, conditions, and species. In exchange, ants receive food, and also shelter within the plants’ internodes. Here we demonstrate that ants repair damage to the host plant when their brood is directly threatened. Using comminuted plant fibers and an unidentified binding liquid (probably plant sap) ants generally began patching holes in the tree trunk immediately, and significantly reduced the size of the hole 2.5 hours after it was created, and they generally completed the repairs within 24 hours.

This study describes the worker and queen castes of the Neotropical ponerine Corrieopone nouraguesgen. nov., sp. nov., an ant from the tropical rainforest in French Guiana. Worker morphology of the taxon is compared with those of other Ponerinae and the similarities between them are discussed, refining the definition of character states for some diagnostic characters at the generic level, providing an identification key to the Neotropical genera, and making some adjustments to the taxonomic framework within the subfamily. Descriptions, diagnosis, character discussion, identification key, and glossary are illustrated with more than 300 images and line drawings. Open science is supported by providing access to measurement data for specimens of the new genus, a matrix of character states for all ponerine taxa evaluated in this study, and specimen data for all examined material. The new or revived combinations presented here are Pachycondyla procidua Emery, comb. rev., Neoponera curiosa (Mackay and Mackay), comb. nov., Leptogenys butteli (Forel), comb. nov., and Bothroponera escherichi (Forel), comb. nov. In addition, Leptogenys butteli is synonymized with Leptogenys myops (Emery), syn. nov.

Cytogenetic studies on fungus-farming ants have shown remarkable karyotype diversity, suggesting different chromosomal rearrangements involved in karyotype evolution in some genera. A notable cytogenetic characteristic in this ant group is the presence of GC-rich heterochromatin in the karyotypes of some ancient and derivative species. It was hypothesized that this GC-rich heterochromatin may have a common origin in fungus-farming ants, and the increase in species studied is important for understanding this question. In addition, many genera within the subtribe Attina have few or no cytogenetically studied species; therefore, the processes that shaped their chromosomal evolution remain obscure. Thus, in this study, we karyotyped, through classical and molecular cytogenetic techniques, the fungus-farming ants Cyphomyrmex transversus Emery, 1894, Sericomyrmex maravalhas Ješovnik et Schultz, 2017, and Mycetomoellerius relictus (Borgmeier, 1934), to provide insights into the chromosomal evolution in these genera and to investigate the presence the GC-rich heterochromatin in these species. Cyphomyrmex transversus (2n = 18, 10m + 2sm + 6a) and S. maravalhas (2n = 48, 28m + 20sm) showed karyotypes distinct from other species from their genera. Mycetomoellerius relictus (2n = 20, 20m) presented the same karyotype as the colonies previously studied. Notably, C. transversus presented the lowest chromosomal number for the genus and a distinct karyotype from the other two previously observed for this species, showing the existence of a possible species complex and the need for its taxonomic revision. Chromosomal banding data revealed GC-rich heterochromatin in all three species, which increased the number of genera with this characteristic, supporting the hypothesis of a common origin of GC-rich heterochromatin in Attina. Although a single chromosomal pair carries rDNA genes in all studied species, the positions of these rDNA clusters varied. The rDNA genes were located in the intrachromosomal region in C. transversus and M. relictus, and in the terminal region of S. maravalhas. The combination of our molecular cytogenetic data and observations from previous studies corroborates that a single rDNA site located in the intrachromosomal region is a plesiomorphic condition in Attina. In addition, cytogenetic data obtained suggest centric fission events in Sericomyrmex Mayr, 1865, and the occurrence of inversions as the origin of the location of the ribosomal genes in M. relictus and S. maravalhas. This study provides new insights into the chromosomal evolution of fungus-farming ants.

One new species in the brachycistidine tiphiid genus Stilbopogon, monveroensis is described from the Monvero Dunes in Fresno Co., California. A revised key to the species of Stilbopogon is included.

The Bulgarian myrmecofauna is one of the richest in the Balkans. This is a result of both the physicogeographical and paleoecological features of the area, as well as relatively well-studied fauna. The earliest myrmecological paper on Bulgarian fauna, listing 54 species, was published 130 years ago. The publication was later followed by numerous new faunistic records and three comprehensive reviews that significantly widened knowledge on the ant diversity from this country. The most recent checklist was released 12 years ago and considered 163 ant species from 40 genera. This work provides an updated checklist of 195 ant species from 43 genera occurring in Bulgaria. Since the last Bulgarian catalogue of ants, 44 species have been added, while 24 species have been synonymised or excluded after critical analysis of the last taxonomic revisions. Additionally, we discuss the status and distribution of 12 species described from Bulgaria, 23 species considered endemic and subendemic for this country, 19 species with conservation status and four non-native species.

Potter wasps (Hymenoptera, Vespidae, Eumeninae) adopt different substrates for nesting, including other wasp nests. Nevertheless, such behavior rarely occurs with abandoned nests of the paper wasps (Hymenoptera, Vespidae, Polistinae). In this study, we report the occurrence involving the nesting of a potter wasp on a paper wasp’s nest. Such a record occurred in November 2021 in a segment of a deciduous forest, at Mata Seca State Park, Southeast Brazil. An abandoned Polistinae nest was found, with 14 cells sealed with mud, from which four male Pachodynerus nasidens individuals emerged. This record of P. nasidens reusing a Polistinae’s nest increases our knowledge of Eumeninae nesting strategies and on possible associations between different groups of vespid wasps.

Biological invasions constitute an opportunity to study the evolutionary processes behind species’ adaptations. The invasive potential of some species, like the Argentine ant (Linepithema humile), has likely been increasing because they show low intraspecific competition. However, multiple introductions over time or genetic divergence could increase the probability of intraspecific competition, constituting barriers for their dispersal and thus, decreasing invasive success. Here, we studied the genetic and behavioural variability of L. humile workers collected at six locations on the NW coast of the Iberian Peninsula, a possible scenario for multiple introductions and population divergence, due to its high level of maritime traffic and complex coastal geography. We analysed behaviours related to spatial navigation (exploration, wall-following), resources acquisition, and competition (inter and intraspecific aggressiveness) through two relevant seasons for the nest ecology: spring and autumn. Genetic analyses using microsatellites indicated that the nests studied belonged to the most spread supercolony in South Europe. However, we identified the existence of two genetically differentiated clusters in Galiza. Lethal interactions were found between workers from different and similar genetic clusters, but a trend suggests higher agonistic behaviours between the two genetic groups. Genetic differences were positively correlated with the geographical distance, but aggressiveness was not correlated with any of them. Ants from each of the tested nests expressed different behaviours with high plasticity through time. Ants from all nests showed more exploration and aggressiveness, less wall-following and faster detection of food in autumn than in spring, with no intraspecific aggressiveness observed in spring. Our findings suggest competition between nests of the same supercolony and behavioural seasonal variability, supporting the hypothesis of divergent evolutionary processes. The results of our work question the assumed unity of supercolonies of this species and offer insights for understanding the future adaptation of L. humile in the introduced areas.

Two nests of Celonites jousseaumei are described in detail from the Antiatlas in Morocco. The nests con-sisted of two or three linearly arranged earthen brood cells that were attached to the almost vertical surface of medium sized stones. The brood cell provisions consisted exclusively of Heliotropium pollen (Boraginaceae). Species affiliation of developmental stages by DNA barcoding revealed that one of the brood cells contained a pupa of Spintharina innesi in a cocoon., Journal of Hymenoptera Research, 93, ISSN:1070-9428, ISSN:1314-2607

Four new species are described: Pseudepipona (Deuterepipona) kostylevi Fateryga, sp. nov. (Turkmenistan, Uzbekistan, Kazakhstan), P. (D.) nikolayi Fateryga, sp. nov. (Kazakhstan), P. (D.) popovi Fateryga, sp. nov. (Turkmenistan), and P. (D.) vladimiri Fateryga, sp. nov. (Kazakhstan). A new synonymy is proposed: Pseudepipona (Deuterepipona) superba (Morawitz, 1867) = P. (D.) tricolor Gusenleitner, 1976, syn. nov. Lectotypes are designated for two species: Pseudepipona (Deuterepipona) herzi (Morawitz, 1895) and P. (D.) superba. Two species, both not occurring in the region under study, are transferred to the subgenus Deuterepipona from the nominotypical one: Pseudepipona (Deuterepipona) priesneri Gusenleitner, 1970 and P. (D.) pseudominuta Gusenleitner, 1971. An identification key to all six species of the subgenus Deuterepipona from Central Asia is provided.

The first vespid species from the Lower Cretaceous Crato formation (Brazil) is described and figured as Curiosivespa sennlaubi Jouault, Rasnitsyn & Nel, n. sp. This new species can be differentiate...

New geolocated records of the invasive ant Linepithema humile (Mayr, 1868) are added to the previous references for the city of Madrid and its surroundings, and the possible causes of the occurrence and permanence of this species in urban areas are discussed. The data collection corresponds to a series of samplings carried out for the last three years in green areas of the city, bibliographic searches, citizen science platforms and personal communications. To date, eleven locations in the urban area of Madrid and four points outside the city have been registered. The city of Madrid is undergoing a colonisation by the Argentine ant, although it is not widespread yet, since observations over time and space are isolated and apparently unrelated. However, this species has a great capacity to disperse and establish new colonies, mainly human-mediated through the transport of goods, plants, gardening tools, etc. Considering the numerous colonizable urban green areas in the city that can provide the necessary conditions for its expansion, the Argentine ant should not be underestimated, and immediate action is strongly recommended.

Variation in wing design and wing loading according to body weight is well studied across taxa of birds and flying insects. Comparable studies have not been made in the few insects that show substantial size variation within the same phenon of a single species. We examine body measures of adults of the social waspDolichovespula maculata(Linnaeus, 1763), with particular attention to the limbs and wing loading. As expected, measures of the length of the legs scales isometrically with overall body weight and size. Against expectation, wing size also scales isometrically with body weight and size. This does not match the general pattern of comparison across species of flying animals, in which larger individuals have relatively larger wings, as a partial compensation for greater wing loading. We suggest that wing size inD. maculatamay be constrained by the demands of life in a crowded nest.

Female diurnal velvet-ants are among the insects most strongly protected against predation. These protections include an exceedingly hard and tightly fitting integument, powerful legs and rapid running ability, aposematic color, aposematic warning stridulation, aposematic odor, and, most famously, legendarily powerful stings. Small to medium-sized velvet-ants were rarely injured or killed in tests against potential predators. Velvet-ant stings are painful, often exceedingly so, but have low toxicity or lethality and are of defensive value primarily by causing intense pain. Despite being well defended against predators they do not form night-time resting aggregations that might enhance mutual protection.

A new fossil myrmicine ant genus and species Lelejus venustusgen. et sp. nov., are described from late Eocene Rovno amber (Priabonian, 33.9–37.8 Ma). This genus differs from all extant and extinct Myrmicinae genera known from the late Eocene European ambers in the combination of morphological features, in particular: 13-segmented antennae with a very short scape and filiform funiculus; 3-segmented maxillary and 2-segmented labial palps; well-developed mandibles with dentate masticatory margin; scutum with broad notauli; forewings with closed cells 1+2r, 3r and mcu, the cell 3r of approximately the same length as cell 1+2r; free vein M branches off from RS approximately at the midlength between the junction of cross-vein 2r-rs with RS and vein m-cu; the cross-vein cu-a is located far from the base of wing, so the branch 1M+Cu is much longer than 2M+Cu. The taxonomic position of the described genus is discussed.

The new genus Erythropompilus Shimizu & Pitts, gen. nov. from the Oriental Region (Pompilidae, Pompilinae) is described, based on the new species E. malaysiensis Pitts & Shimizu, sp. nov. from Malaysia. Two other new species of this genus, E. thailandensis Pitts & Shimizu, sp. nov. from Thailand and E. taiwanensis Pitts & Shimizu, sp. nov. from Taiwan, are also described. A key to the species is provided, and the taxonomic position of the genus is discussed.

A new Old World genus in the tribe Trogaspidiini Bischoff, 1920, Arkaditillagen. nov., is described based on male morphology. Six species are recognized in this genus: A. bagrada (Cameron, 1902), comb. nov. (Indonesia, Malaysia), A. depressicornis (Mickel, 1935), comb. nov. (Malaysia), A. frimsp. nov. (Malaysia), A. gibbasp. nov. (Indonesia), A. lelejisp. nov. (Indonesia), and A. nallinia (Zavattari, 1914), comb. nov. (Indonesia). The species of this new genus were formerly placed in the genus Krombeinidia Lelej, 1996, but they are differentiated from it and other genera by having a unique set of morphological character states, such as the mandible inner margin expanded, forming subbasal tooth; the paramere antero-ventrally serrate; and the digitus dorsal margin lamellate. A key to species of Arkaditilla is provided.

Two new species of the subfamily Dorylinae Leach, 1815 namely Parasyscia ganeshaiahisp. nov. and Syscia indicasp. nov. are described and illustrated based on the worker caste. These species were collected in the Eaglenest Wildlife Sanctuary, Arunachal Pradesh, Northeast India. Keys to Parasyscia of India and Syscia of Asia are provided based on the worker caste.

Two queen ant specimens, one alate and one dealate, from mid-Cretaceous (Late Albian–Early Cenomanian) Burmese amber are herein reported as belonging Haidomyrmex cerberus Dlussky, 1996. This is the first discovery and documentation of an alate queen in Haidomyrmex. Compared with workers of Haidomyrmex cerberus, alate and dealate queens are larger in body size, have smaller compound eyes, a longer antennal scape, more complex mandibles, and a relatively large-sized metasoma. It is hypothesized that these differences are due to caste differences.

We describe five new Neotropical species of Ripersiella living in association with Acropyga ants: R. campensissp. nov., R. illicianssp. nov., R. montanaesp. nov., R. pediandensissp. nov., and R. telaliasp. nov. We also redescribe R. andensis and R. colombiensis based on type specimens and other collections. Together, these seven species form a morphologically similar group that we informally refer to as the andensis-complex of Ripersiella. All members of the andensis-complex are confirmed or are speculated to be mutualists of Acropyga ants. We discuss the implications of these associations and provide an identification key to the Neotropical species of Ripersiella that are lacking bitubular cerores, including the new species.

Mimicry is usually understood to be an adaptive resemblance between phylogenetically distant groups of species. In this study, we focus on Batesian and Müllerian mimicry, which are often viewed as a continuum rather than distinct phenomena, forming so-called Batesian-Müllerian mimicry rings. Despite potent defence and wide environmental niche of hornets, little attention has been paid to them as potential models in mimicry research. We propose a Batesian-Müllerian mimicry ring of the Oriental hornet (Vespa orientalis, Hymenoptera: Vespidae) consisting of eight species that coexist in the Mediterranean region. To reveal general ecological patterns, we reviewed their geographical distribution, phenology, and natural history. In accordance with the ‘model-first’ theory, Batesian mimics of this ring occurred later during a season than the Müllerian mimics. In the case of Batesian mimicVolucella zonaria(Diptera: Syrphidae), we presume that temperature-driven range expansion could lead to allopatry with its model, and, potentially, less accurate resemblance to an alternative model, the European hornet (Vespa crabro: Hymenoptera: Vespidae). Colour morphs of polymorphic speciesCryptocheilus alternatus(Hymenoptera: Vespidae),Delta unguiculatum(Hymenoptera: Vespidae),Rhynchium oculatum(Hymenoptera: Vespidae), andScolia erythrocephala(Hymenoptera: Scoliidae) appear to display distinct geographical distribution patterns, and this is possibly driven by sympatry with alternative models from the European hornet (Vespa crabro) complex. General coevolution patterns of models and mimics in heterogenous and temporally dynamic environments are discussed, based on observations of the proposed Oriental hornet mimicry ring.

Asian weaver ants (Oecophylla smaragdina) are an important biocontrol agent in agricultural habitats. We conducted surveys in oil palm plantations in Riau, Indonesia for an obligate myrmecophilous butterfly larvae, Liphyra brassolis (Lepidoptera, Lycaenidae), that is known to consume weaver ant larvae in other habitat types. We found L. brassolis larvae in five of the twenty nests surveyed, with larval presence not being related to weaver ant nest size. We also observed L. brassolis larvae in a weaver ant mass rearing facility. This is the first report of L. brassolis from oil palm plantations and may have implications for the use of weaver ants as biological control agents.

A preliminary checklist of Chrysididae, Mutillidae, Pompilidae, Vespidae, Sphecidae, Crabronidae, and Apoidea of the Shatsk National Natural Park are provided. Among 139 currently registered species, 56 species are recorded for the park territory for the first time, 5 species are listed in the Red Data Books of Ukraine, Belarus, and Poland, and 83 species belong to IUCN categories. One invasive species (Isodontia mexicana) was found in Volyn Region for the first time.