Stenodynerus strigatus 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 : 22-24

Taxon classification Animalia Hymenoptera Vespidae

Stenodynerus strigatus Ma & Li sp. n. Figs 23-29

Material examined.

Holotype, ♀, China, Shaanxi Prov., Ankang City, Langao County, Huanli Town, 32°12'52.77"N, 109°0'17.90"E, 1808 m, 7.VIII.2015, Yan Peng & Wenkai Zhou, No. 1004075 (CQNU).

Description.

Female (Figs 23-29): body length 8.3 mm, forewing length 7.7 mm. Black; the following spots yellow: a basal transverse median spot and two small obscure apical spots on clypeus (Fig. 24), inter-antennal spot, and scape ventrally; small post-ocular spot, pronotal dorsum except posterior apex, mesepisternal spot, parategula, metanotum largely (Fig. 27), apical bands on metasomal terga I–II and sternum II, and a long band on fore and mid tibiae dorsally ferruginous; tegula brown.

Head. Clypeus convex medially, moderately punctate, somewhat reticulate, with sparse and short setae, its width more than length (width 1.25 × length), apex slightly emarginated, apical width: emargination depth = 0.29: 0.06, total width: apical width = 1.02: 0.29 (Fig. 24); frons and vertex densely punctate, with short setae; cephalic fovea obsolete.

Mesosoma. Masosoma densely punctate and reticulate, punctures generally larger than those on the head; punctures on pronotal dorsum denser than those on others parts of the masosoma (Fig. 23). Anterior surface of pronotum sloping, shinning, with few punctures and a pair of round separated median foveae, the interspace between these two median foveae much more than one diameter, pronotal carina complete (Fig. 25); scutellum distinctly convex; metanotum nearly vertical; dorsal and lateral surfaces of propodeum reticulate-punctate, dorsal surface narrow with a weak shelf, posterior surface concave with long and transverse rugae and a median longitudinal carina (Fig. 27).

Metasoma. In dorsal view, tergum I campanulate, coarsely punctate, width 1.58 × length and 0.81 × width of tergum II, anterior surface vertical, almost impunctate, and with a median longitudinal carina and two transverse striations (Fig. 26); tergum II with smaller and sparser punctures than tergum I, and with a broad reflex apical lamella, dense and deep punctures forming a wide transverse groove on the base of lamella (Fig. 29); sternum II sparsely punctate, without a median longitudinal furrow basally, and its anterior surface almost vertical (Fig. 28).

Male. Unknown.

Remarks.

This species is similar to Stenodynerus pappi by a median longitudinal carina on propodeal concavity (Fig. 27), anterior vertical surface of tergum I with a longitudinal median carina in upper half (Fig. 26), and tergum II with a broad reflex apical lamella (Fig. 29). It is different from Stenodynerus pappi and other members of the genus in the following characters: a transverse median spot and two obscure apical spots on clypeus basally yellow (Fig. 24), pronotal dorsum mostly ferruginous (Fig. 25), the interspace of pronotal median foveae much more than one fovea diameter (Fig. 25), anterior vertical surface of tergum I with two transverse striations (Fig. 26), and sternum II without a median longitudinal furrow basally, and its anterior surface almost vertical (Fig. 28).

Distribution.

China (Shaanxi).

Etymology.

The specific name is the Latin adjective strigatus, which refers to the anterior vertical surface of tergum I with two transverse striations.