Stenodyneriellus longitergus, Li, Ting-Jing & Carpenter, James M., 2019

Li, Ting-Jing & Carpenter, James M., 2019, Descriptions of three new species of the genus Stenodyneriellus Giordani Soika with keys to some related species (Hymenoptera, Vespidae, Eumeninae), ZooKeys 820, pp. 71-81 : 71

Stenodyneriellus longitergus sp. n. Figs 12-15

Material examined.

Holotype, ♀, Indonesia, Latimodjong Mts Bontce Batoe Dist, 18-25.V.1931, 4000 m a.s.l., leg. DEI Celebes, & CF Clagg, deposited in AMNH.

Description.

Female (Fig. 12): body length 10.0 mm, forewing length 10.5 mm. Black, with the following parts ferruginous: clypeus except for a dark central spot (Fig. 13), mandible, a band along inner eye orbit from base of clypeus to ocular sinus, antenna, large interantennal spot, gena mostly, pronotum except for lateral side and apical surface, a large dorsal spot on mesepisternum, tegula, parategula, T1 except for apical band and black submedian spot, S1, and all legs; following parts yellowish brown: scutellum except apex, basal band of metanotum, apex of propodeum, an apical band on each of T1-T5 and S2-S5 (Fig. 15). Wings infuscate. Setae brown.

Head. Clypeus (Fig. 13) densely punctate and evenly convex, approximately as wide as long, total width 2.25 × apical width, apex wider than (1.33 ×) interantennal space, almost truncated and just slightly emarginated mesally; interantennal carina prominent; A5 wider than long; frons evenly convex, and coarsely and densely punctate, interspaces carinate and reticulate; punctures on vertex and gena slightly sparser than those of frons; POD much shorter than (0.6 ×) OOD.

Mesosoma. Pronotal carina complete, waved dorsally and slightly emarginated laterally; anterior surface of pronotum smooth; dorsal surface of pronotum densely punctate, interspaces between punctures carinate, punctures on mesoscutum, mesoscutellum, mesepisternum and metanotum similar to or slightly sparser than those of pronotum; mesoscutum convex; mesoscutellum flat; metanotum slightly sloping apically; dorsal surface of propodeum thickly punctate, punctures shallow, flat bottomed and interspaces distinctly carinate and reticulate, in the same horizontal plane as metanotum, without teeth behind metanotum, with superior carina; posterior surface widely and deeply depressed forming a central cavity (Fig. 14), clearly separated from dorsal surface, both posterior and lateral surfaces coarsely punctate and with thin and transverse striae; tegula longer than wide, and posterior lobe small and somewhat shorter than parategula.

Metasoma. In dorsal view, T1 (Fig. 15) elongate, approximately as long as wide apically, much narrower than (0.68 ×) T2, basally without a transverse carina, anterior surface not well-separated from dorsal surface, dorsal surface of T1 except for apical band densely punctate, interspaces between punctures slightly less than diameters and distinctly sparser than those of propodeum; T2 without a translucent and blade-shaped lamella apically, punctures on T2 and other terga smaller and sparser than those of T1; S2 widely depressed basally and sparsely punctate; apical bands of T1-T2 wider than those of other terga, and those of T2-T5 with small gaps medially.

Remarks.

This species is similar to three Philippine species ( S. nitidus Giordani Soika, S. plurinotatus Giordani Soika, and S. rufinodus Giordani Soika) in sharing the elongate character of T1: it is approximately as long as wide at the apex, and much narrower than T2. It differs from these three related species as shown in the following key.

Distribution.

Indonesia.

Etymology.

The specific name longitergus is derived from two Latin words, long and tergus, which refers to T1 being elongate, approximately as long as wide apically.