Allodynerus reduncus Zhang, Chen & Li, 2020

Zhang, Xue, Chen, Bin & Li, Ting-Jing, 2020, A taxonomic revision of Allodynerus Blüthgen (Hymenoptera: Vespidae: Eumeninae) from China, Zootaxa 4750 (4), pp. 545-559 : 547-549

Allodynerus reduncus Zhang, Chen & Li , sp. nov.

( Figs 1–12)

Material examined. Holotype, 1♀, China, Yunnan prov., Diqing City, Deqin County, Foshan Town , Meishi Vil- lage, 28°43′15″N, 98°41′6″E, 2155 m, 22.VII.2014, Tingjing Li ( CQNU); paratype, 2♂, same label as holotype ( CQNU).

Description. Female ( Fig. 1). Body length 8.95 mm. Black, following parts yellow to brownish yellow: clypeus except apical margin and a central and small spot ( Fig. 3), most of mandible, a short band along lower inner eye orbit, inter-antennal spot, scape, ventral side of pedicel, an elongated band on temple, most of pronotum, upper part of anterior face of pronotum ( Fig. 8), large spot on mesepisternum, tegula except a central translucent spot, parategula, metanotum ( Fig. 1), posterolateral band of propodeum, apical band on each of both terga I–VI and sterna II–VI, an arcuate transverse band in the middle of sternum II (almost integrated with apical band) ( Figs 5–6), and legs largely; wings lightly brown. Body with dense, pale brown setae, setae on propodeum relatively longer than those of other parts.

Head. Clypeus ( Fig. 3) 1.28× as wide as long in frontal view, densely punctate, apex slightly emarginate, emargination width about 1/4 of clypeal width; mandible normal, third tooth without a deep incision; frons, vertex and temple with reticulate punctures, punctures on frons relatively denser than those on other parts of head; smooth area around cephalic foveae extended to outer margin of posterior ocellus ( Fig. 8).

Mesosoma. Mesosoma with coarse punctures, dorsal surface of pronotum and mesonotum somewhat reticulate and coarser than other parts of mesosoma; pronotal humeral angle blunt ( Fig. 8); setae on anterior part of mesonotum not brush-like in lateral view; mesopleuron with dense punctures, not reticulate ( Fig. 9); scutellum flat, rectangle, and punctures somewhat sparser than those on mesonotum; metanotum coarsely punctate, slightly concave mesally; dorsal face of propodeum with honeycomb punctures, upper margin of lateral face with weak sparse punctures and other part coriaceous ( Fig. 9), posterior face with minute transverse striae and one median longitudinal carina ( Fig. 7); ventral side of fore trochanter and femur with short and dense setae.

Metasoma. Tergum I 1.40× as wide as long in dorsal view, with coarse and dense punctures, punctures except apex coarser than those on mesosoma, and gradually and sparser from base to apex ( Fig. 5); punctures of tergum II more or less smaller and sparser than those of tergum I, tergum II with a wide apical lamella strongly bent backward up, two rows of dense and deep punctures forming a wide transverse groove on the base of lamella ( Fig. 5); sternum II ( Fig. 6) convex basally and punctate, punctures at the apex denser; punctures at visible part of metasomal segment III slightly denser than those of segment II.

Male ( Fig. 2). Body length 7.22–7.36 mm. Sculpture, punctation, setae, and coloration as in female except the follows: clypeus wholly yellow, mandible yellow except apex brownish brown to black, tergum II without an arcuate transverse band in the middle; clypeus about as wide as long in frontal view, slightly convex mesally, with smaller and sparser punctures ( Fig. 4); terminal antennal segment hooked and bent backward to the base of segment XI ( Fig. 10); genitalia as in figure 11: apex of volsella short, wide and more or less pointed, penis valve as in figure 12: ventral lobe of penile valve erect and basal apodeme slightly curved from base to apex, with a tiny bulge near the middle, basal plate of penile valve claviform and at apex gradually narrowed.

Distribution. China (Yunnan).

Remarks. This species is similar to A. mandschuricus Blüthgen, 1953 , in sharing with its smooth area around cephalic foveae extended to outer margin of posterior ocellus ( Figs 8, 51), third tooth of mandible without one deep incision, apex of volsella short and wide ( Figs 11, 57), and basal plate of penis valve claviform ( Figs 12, 58). It differs from A. mandschuricus and other members of the genus by the following character combination: body with abundant brownish yellow markings ( Figs 1, 2), clypeus of female without two longitudinal lateral carinae apically ( Fig. 3), the bulge of basal apodeme closer to middle ( Figs 12, 58) (a little farther from the middle in A. mandschuricus , Fig. 58) and apical lamella of tergum II wider and more strongly bent backward up ( Figs 5, 59) (narrower and less strongly bent backward and up or not bent in A. mandschuricus ).

Etymology. The specific epithet is derived from the Latin word: reduncus (=bent backward), referring to the apical lamella of tergum II that is wide and strongly bent backward and up.