Stenodynerus reflexus 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 : 20-22

Taxon classification Animalia Hymenoptera Vespidae

Stenodynerus reflexus Ma & Li sp. n. Figs 7-13

Material examined.

Holotype, ♀, China, Yunnan Prov., Baoshan City, Tengchong County, Beihai Village, 25°16'48.82"N, 98°34'49.16"E, 1783 m, 13.VII.2011, Xin Zhou, No. 1004070 (CQNU).

Description.

Female (Figs 7-13): body length 7.4 mm, forewing length 5.8 mm. Black; with the following spots ferruginous: clypeus except median interruption basally (Fig. 8), inter-antennal spot, ventral scape, post-ocular spot, a broad band on the pronotal dorsum, mesepisternal spot, parategula, metanotum except posterior apex ventrally, apical bands on metasomal terga I–II and sternum II, a long band on the dorsal surface of the fore tibia; tegula brown.

Head. Clypeus with sparse punctures, and with setae basally and laterally, its width much more than length (width 1.24 × length), apex moderately emarginated, apical width: emargination depth = 0.25: 0.08, total width: apical width = 0.88: 0.25 (Fig. 8); frons densely punctate, punctures on vertex somewhat weaker than those on frons; frons and vertex with dense setae; cephalic fovea obsolete.

Mesosoma. Masosoma densely punctate and reticulate except metanotum, punctures generally larger than those on the head; punctures on metanotum sparser and shallower than those on other parts of the mesosoma. Anterior surface of pronotum slightly sloping, distinctly punctate, and with a pair of round separated median foveae, the interspace between these two median foveae less than one fovea diameter, pronotal carina complete (Fig. 9); scutellum distinctly convex; metanotum nearly vertical; dorsal and lateral surface of propodeum reticulate-punctate, dorsal surface narrow with a developed shelf, posterior surface concave with long and transverse rugae and a median longitudinal carina (Fig. 11).

Metasoma. In dorsal view, tergum I campanulate, coarsely punctate, width 1.37 × length and 0.85 × width of tergum II, anterior surface vertical, almost impunctate, and with a median longitudinal carina in upper half (Fig. 10); 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. 13); sternum II sparsely punctate, basally with a very short median longitudinal furrow, and its anterior surface almost vertical (Fig. 12).

Male. Unknown.

Remarks.

This species is similar to Stenodynerus pappi by having the propodeal shelf developed, a median longitudinal carina on propodeal concavity (Fig. 11, 81), anterior vertical surface of tergum I with a longitudinal median carina in upper half (Fig. 10). It is different from Stenodynerus pappi and other members of the genus in the following characters: clypeus basally ferruginous except median interruption (Fig. 8), a broad band on pronotum (Fig. 9), and sternum II with a very short median longitudinal furrow basally, and its anterior surface almost vertical (Fig. 12).

Distribution.

China (Yunnan).

Etymology.

The specific name is the Latin adjective reflexus, which refers to the apical lamella of metasomal tergum II broadly reflexed.