Ancistrocerus hangaicus Kurzenko, 1977

Fateryga, Alexander V. & Mokrousov, Mikhail V., 2019, New records of eumenine wasps (Hymenoptera: Vespidae: Eumeninae) from Russia with description of a new species of Leptochilus de Saussure, 1853, Zootaxa 4612 (3), pp. 412-422 : 413

Ancistrocerus hangaicus Kurzenko, 1977

( Figs 1–3 )

Material examined. Russia. Altai Republic: Kosh-Agach District, 15 km SE Kuray, Chuya River (50°11′N, 88°07′E), 1600 m, 29. VI .2016, 1 ♂, 6. VII.2016, 1 ♂, 8. VII.2016, 1 ♂, leg. V.M. Loktionov, M.Yu. Proshchalykin; Kosh- Agach District , 12 km SE Aktash, Chuya River (50°14′N, 87°43′E), 1570 m, 4. VII.2016, 1 ♀, 1 ♂, 13. VII.2016, 1 ♀, leg. V.M. Loktionov, M.Yu. Proshchalykin; Kosh-Agach District , 5 km SE Chagan-Uzun, Tydtuyaryk River (50°04′N, 88°25′E), 1780 m, 11. VII.2016, 1 ♂, leg. V.M. Loktionov, M.Yu. Proshchalykin [ CAFK] .

Description of male. Body length (from head to apical margin of tergum 2) 6.5– 7 mm; fore wing length 6–6.5 mm.

Head 1.1× as wide as long in frontal view, with dense long pale setae, some longer than distance between posterior ocelli. Vertex with dense coarse punctures. Clypeus with sparse minute punctures; 0.7× as wide as long; apical emargination semicircular, taking 0.3 of clypeal anterior margin; apical teeth triangular. Scape with sparse small punctures; flagellomere 11 folded backwards, reaching distal part of flagellomere 8. Dorsal mesosoma setae as on head. Pronotal carina weaker on dorsum, but rectangularly produced at lateral corners. Pronotum and scutum with dense punctures larger than interstices, coarser than on vertex. Tegula slightly shiny, with fine punctures denser on inner part. Dorsal and ventral mesepisterna with large cell-like punctures. Scutellum with coarse punctures, slightly larger than on scutum but distinctly sparser, with shining interstices. Metanotum and propodeum with celllike punctures smaller than on mesepisterna. Scutellum and metanotum slightly convex. Propodeal concavity with median and lateral carinae. Legs from femora to tarsi with short pale pubescence. Tergum 1 setae somewhat shorter than on mesosoma and much sparser; terga 2–7 with short pubescence. Transverse carina of tergum 1 well developed, with narrow shallow median notch visible in anterior view; posterior part of tergum 1 1.4× as wide as long in dorsal view. Tergum 1 with somewhat smaller and distinctly sparser punctures than on vertex. Punctures on tergum 2 smaller sparser than on tergum 1. Sternum 2 roundly truncated behind basal sulcus, its posterior part distinctly convex in lateral view. Sculpture on sternum 2 as on tergum 2 with intervals shining.

Basal color black. Following parts lemon-yellow: mandible except base and teeth, labrum, clypeus, spot on frons between upper margins of antennal foveae, tiny spots near inner margins of eyes above clypeus, tiny spots on temples at dorso-lateral corners of head, scape frontally and ventrally, anterior band on pronotum, distal parts of fore and mid femora ventrally, entire tibiae, apical band on tergum 1 slightly extending over its lateral margins, apical bands on terga 2–3, apical band on tergum 4 (reduced in 2 specimens), apical band on sternum 2, and apical lateral spots on sternum 3. Following parts brownish: flagellomeres 1 and 6–9 ventrally as well as distal part of flagellomere 9 dorsally, entire flagellomeres 10 and 11, outer part of tegula, small distal parts of femora dorsally, and entire tarsi. Wing strongly fuscous, particularly on marginal cell.

Distribution. Russia: Western Siberia (Altai), Eastern Siberia (Irkutsk Prov., Buryatia, Zabaikalskiy Terr.), Far East (Magadan Prov.).— Mongolia.

Remarks. This species was previously known only from females ( Kurzenko 1977; Fateryga et al. 2017). Five males collected in Altai (one of them together with a female) proved to be A. hangaicus . The species expresses sexual dimorphism in coloration: females have whitish bands on the body and ferruginous legs, while the light-colored parts of males are yellow. The same dimorphism is peculiar to another mountainous species, A. kazbekianus ( Kostylev, 1940b) (Fateryga 2017) .

Figures

FIGURES 1–5. Males of Ancistrocerus hangaicus Kurzenko, 1977 (1–3) and Jucancistrocerus (Eremodynerus) minutepuncta‑ tus Giordani Soika, 1970 (4–5). 1, 4, habitus in dorsal view. 2, 5, head in frontal view. 3, metasoma in ventral view.