Stenodynerus similibaronii Ma & Li

Ma, Zhen-xia, Chen, Bin & Li, Ting-jing, 2016, A taxonomic account of the genus Stenodynerus from China, with descriptions of five new species (Hymenoptera, Vespidae, Eumeninae), ZooKeys 595, pp. 17-48 : 22

Taxon classification Animalia Hymenoptera Vespidae

Stenodynerus similibaronii Ma & Li sp. n. Figs 14-22, 45

Material examined.

Holotype, ♀, China, Yunnan Prov., Baoshan City, Tengchong County, Shangying Village, 25°0'54.72"N, 98°39'12.86"E, 1823 m, 31.VII.2015, Zhenxia Ma & Long Li, No. 1004071 (CQNU). Paratypes: 1♀♀2♂♂, the same data as holotype, Nos. 1004072, 10040743, 1004074 (CQNU).

Description.

Female (Figs 14, 16, 18, 21-22, 45): body length 7.0 mm, forewing length 6.5 mm. Black; with the following spots pale ferruginous: a basal band of clypeus (Fig. 16), ventral scape, inter-antennal spot, post-ocular spot, spots on outsides of tegula anteriorly and posteriorly, parategula, apexes of femora to terminal tarsi, and apical bands on metasomal terga I–II and sternum II; a band on dorsal surface of pronotum except median interruption (Fig. 18), and metanotum except posterior apex ventrally dark ferruginous (Fig. 21); tegula brown.

Head. Clypeus with moderate punctures, lateral surface with sparse setae, its width somewhat more than length (width 1.09 × length), apex slightly emarginated, apical width: emargination depth = 0.33: 0.07, total width: apical width = 1.00: 0.33 (Fig. 16); frons and vertex densely punctate and reticulate; frons with sparse and very short setae, setae on vertex denser than those on frons.

Mesosoma. Masosoma densely punctate and reticulate; punctures generally larger than those on the head; punctures on pronotal dorsum and mesoscutum somewhat denser than those on other parts of the masosoma (Fig. 14). Anterior surface of pronotum almost vertical with few small punctures, median foveae contiguous and V-shaped, a few short transverse carinae above median foveae, pronotal carina interrupted medially (Fig. 18); scutellum distinctly convex; metanotum oblique; dorsal and lateral surfaces of propodeum reticulate-punctate, dorsal surface broad with a weak shelf, posterior surface concave with long and transverse rugae and a median longitudinal carina (Fig. 21).

Metasoma. In dorsal view, tergum I domed, densely punctate, width 1.35 × length and 0.84 × width of tergum II; tergum II with smaller and sparser punctures than tergum I, apex with deeper and denser punctures than other parts of tergum II, and apical margin without a distinct lamella (Fig. 45); sternum II sparsely punctate, with a long median longitudinal furrow basally, and its anterior surface sloping (Fig. 22).

Male (Figs 15, 17, 19, 20): body length 6.8 mm, forewing length 5.6 mm. Sculpture, punctuation, setae and coloration similar to those of female except the follows: entire clypeus, mandible except apical portion, ventral scape and inter-antennal spot yellow; clypeus strongly, convex medially, with sparse and small punctures, its width equal to length, apex deeply emarginated and U-shaped, apical width: emargination depth = 0.27: 0.12, total width: apical width = 0.8: 0.27 (Fig. 17); punctures on apex of tergum II deeper than those in female; width of tergum I 1.45 × length and 0.79 × width of tergum II; the terminal segment of antenna bent backward like a hook, apex reaching the base of segment XI (Fig. 19). Male genitalia as in Fig. 20, volsella with setae and slightly truncate apically, parallel spines elongate without setae, penis valve rounded apically.

Remarks.

This species is similar to Stenodynerus baronii by a basal band of clypeus (Fig. 16), metasomal sternum II with a long median longitudinal furrow basally (Fig. 22), and propodeal concavity with a median longitudinal carina (Fig. 21). It is different from Stenodynerus baronii and other members of the genus in the following characters: anterior surface of pronotum with wider V-shaped median foveae (Fig. 18), punctures on apex of metasomal tergum II sparser (Fig. 45), and male volsella of genitalia narrower and slightly truncate apically than the corresponding parts in Stenodynerus baronii (Figs 20, 41).

Distribution.

China (Yunnan).

Etymology.

The specific name similibaronii is a Latin adjective which refers to the similar species of Stenodynerus baronii .