Stenodyneriellus depressus, Li & Chen, 2016

Li, Ting-Jing & Chen, Bin, 2016, Two newly recorded genera Stenodyneriellus and Lissodynerus with three new species from China (Hymenoptera, Vespidae, Eumeninae), Journal of Hymenoptera Research 49, pp. 111-127 : 117

Stenodyneriellus depressus sp. n.

Figs 15-23

Material examined.

Holotype, ♂, China, Yunnan Province, Baoshan City, Lujiang Town, Pumanshao , 25°01'32.16"N, 98°57'57.20"E, 773m, 17. VII. 2006, Rui Zhang, No. 1004065 (CQNU) . Paratypes: 1♂; same data as holotype, No. 1004066 (YNAU) ; 1♀, China, Yunnan Province, Xishuangbanna State, Menghai County, Mangao Village , 22°01'10.11"N, 100°20'6.96"E, 716m, 26. VII. 2011, Xin Zhou, No. 1004067 (CQNU) .

Description.

Female (Fig. 15 , 18 , 21-23 ): body length 8.5 mm, forewing length 7.0 mm. Black, with the following parts pale ferruginous (Fig. 15 ): dorsal surface of pronotum medially, a very small dorsal mesepisternal spot, a transverse band on the basis of scutellum, small spots on dorsal surface of propodeum medially and laterally, and a apical band on each of T1-T2 and S2; the following parts yellow: a wide arcuate band basal-laterally and a apical spot on clypeus laterally (Fig. 18 ), a spot on mandible basally, scape ventrally, a large and wide band along inner eye orbit from basis of clypeus to upper margin of ocular sinus (not occupying entire ocular sinus), interantennal spot, a long postocular band, tegula outside, parategula, fore and mid femora apically and tibiae laterally, and a spot on apex of mid coxa inside; antenna except scape ventrally and tegula except outside brown. Wings lightly infuscate. Setae pale brown.

Head. Clypeus medially convex, sparsely punctate and interspaces with shallow, very thick and minute punctures, apex moderately emarginated medially (Fig. 18 ), clypeal width approximately equal to its length, total width: apical width = 1.09: 0.4, apex wider than interantennal space; interantennal carina prominent; frons evenly convex and very coarsely punctate, interspaces between punctures with carinae and reticulate; vertex very sparsely punctate, cephalic fovea obsolete; POD nearly as wide as OOD.

Mesosoma. Pronotum, mesoscutum, mesepisternum, mesoscutellum, metanotum, and dorsal and lateral surfaces of propodeum coarsely and deeply punctate and reticulate, these punctures distinctly deeper than those on frons, punctures on pronotum, mesoscutum, and mesoscutellum sparser than those on mesepisternum, metanotum and propodeum, and their interspaces with very small and shallow punctures. Pronotal carina complete, rounded dorsally and emarginated laterally; mesoscutum, mesepisternum, mesoscutellum normal; metanotum with a very short dorsal convex surface and sloping posteriorly (Fig. 21 ); dorsal surface of propodeum almost in the same horizontal plane as metanotum, without teeth behind metanotum, interspaces between punctures distinctly carinate (Fig. 21 ), and well-separated from posterior surface; posterior surface widely and deeply concave, very sparsely punctate and interspaces between punctures smooth. Tegula wide, length slightly longer than its width, and posterior lobe small; parategula hooked and its apex reaching the apex of tegula.

Metasoma. In dorsal view, T1 domed, width 1.47 × its length and 0.80 × width of T2, without a transverse carina anteriorly, sparsely punctate, interspaces between punctures larger than one diameter, punctures distinctly smaller than those on frons and mesosoma; tergum 2 without a lamella (Fig. 22 ) apically, punctures similar to those on T1; S2 distinctly depressed basally and moderately punctate (Fig. 23 ), punctures larger and denser than T2, and generally smaller than those on head and mesosoma; visible parts of T3-T6 and S3-S6 coriaceous and with minute punctures; the apical yellow bands on T1-T2 with gaps medially.

Male (Figs 16-17 , 19-20 ). Body length 8.0 mm, forewing length 7.5 mm. Sculpture, punctuation, setae, and coloration as in female except as follows: clypeus entirely yellow (Fig. 19 ), interantennal spot orange-yellow, spots on mandible and interantennal space larger than those in female, propodeum without spots; clypeal width 0.93 × its length, total width: apical width = 0.95: 0.41, apical emargination slightly deeper than that in female; A13 backward reaching apical margin of A10 (Fig. 20 ); width of T1 1.60 × its length and 0.80 × width of T2; genitalia as in Fig. 17 , apical tip of penis valve rounded, volsella wide and rounded apically, and parallel spines elongate without setae; other characters same as those in female.

Distribution.

China (Yunnan).

Remarks.

This species resembles S. perpunctatus Giordani Soika, 1994 from Malaysia by T2 without an apical lamella (Fig. 22 ), dorsal surface of propodeum not protruding upward so as to form two teeth behind metanotum, and propodeum with large dense punctures dorsally, interspaces between punctures carinate (Fig. 21 ). It differs from S. perpunctatus and all other members of the genus by the following character combination: clypeal apex moderately emarginated medially, apical width somewhat wider than interantennal space (Figs 18-19 ), S2 distinctly depressed basally (Fig. 23 ), and mesosoma and metasoma with pale ferruginous spots and bands (Fig. 15-16 ).

Etymology.

The specific name is derived from two Latin words: de - and pressus, referring to S2 of the species being distinctly depressed basally.

Figures

Figures 15 - 23. Stenodyneriellus depressus sp. n. 15 habitus of one paratype (dorsal view), ♀ 16 habitus of holotype (dorsal view) (dorsal view), ♂ 17 genitalia (front view), ♂ 18 clypeus, ♀ 19 clypeus, ♂ 20 apex of antenna, ♂ 21 metanotum and propodeum, ♀ 22 T 2 (dorsal view), ♀ 23 S 2 (ventral view), ♀.