Ismarus nigritrochanter Liu, Chen & Xu

Liu, Jing-xian, Chen, Hua-yan & Xu, Zai-fu, 2011, Notes on the genus Ismarus Haliday (Hymenoptera, Diapriidae) from China, ZooKeys 108, pp. 49-60 : 52-54

Ismarus nigritrochanter Liu, Chen & Xu sp. n. Figs 5-8

Holotype.

Female. Body length 3.1 mm; fore wing length 3.1 mm.

Description.

Head. Head in dorsal view 2.0 times as wide as long; vertex abruptly sloping behind post ocelli; temple narrowed behind eyes; occipital carina complete, not crenulate; POL as long as OOL; toruli separated from each other; face setose along inner orbits; frons flat and smooth, with punctures above antennal sockets and setose; clypeus evenly convex; epistomal sulcus distinct; eye height 4.0 times length of malar space; malar sulcus absent. Antenna 1.1 times length of body; scape cylindrical, with apical rim simple; pedicel basally attenuate and apically broad; ratios of length to width of antennal segments: 30: 10; 15: 8; 20: 7; 25: 7; 20: 7; 20: 7; 18: 7; 18: 9; 17: 9; 17: 9; 16: 9; 16: 9; 16: 9; 15: 9; 23: 9.

Mesosoma. Mesosoma in dorsal view 0.8 times as long as width of head; pronotum angular in dorsal view, coarsely punctate anteriorly and setose; lateral side of pronotum with upper and anterior margins rugose-punctate, striate on lower 2/3 and smooth on upper 1/3; mesoscutum smooth and convex, with sparse long setae near humeral sulcus and notauli; notauli anteriorly present, oblique long and pit-like, weakly crenulate inside; humeral sulcus deep and crenulate, 1.5 times length of tegula; anterior scutellar pit transverse, crenulate inside, median longitudinal carina indistinct; scutellum smooth, posterior rim rounded; propodeum rugose, with transverse and longitudinal carinae distinct; mesopleuron smooth, with sparse setae on lower side; metapleuron rugose and setose.

Wings. Fore wing with costal, subcostal, basal, marginal, stigmal and postmarginal veins tubular; radial cell closed, 0.6 times length of marginal vein and 2.0 times as long as its height. Hind wing with a basal cell.

Legs. Fore and middle legs slender; hind tibia strongly incrassate.

Metasoma. Petiole transverse, with irregular longitudinal carinae; second tergite smooth and with a few scattered setae along lower side, median furrow short, extending to 0.2 length of second tergite; seventh tergite densely punctate; sutures between tergites complete and well impressed; sternites finely punctate and setose.

Colour.

Body black. Antenna entirely black. Legs brown, with coxae and trochanters black; fore and middle femora reddish brown with basal 0.3 and dorsal margin blackish; hind femur dark brown; hind tibia dark brown, with dorsal apical 3/4 brown. Wings hyaline, veins dark brown.

Male.

Unknown.

Distribution.

China (Yunnan).

Material examined.

Holotype, female. CHINA: Yunnan, Mt. Gaoligonshan (25.98°N, 98.80°E), 2006.VII.20-21, Zhong-shi Zhou, No. 200700989.

Diagnosis.

This species belongs to the Ismarus halidayi -group and is similar to Ismarus longus sp. n., but it can be easily distinguished from the latter by having the second flagellomere 3.5 times as long as wide (5.0 times in Ismarus longus ); the radial cell of the fore wing 2.0 times as long as high (3.0 times); the seventh tergite densely punctate (finely mat); and the antenna uniformly black, all trochanters black (scape, pedicel and first flagellomere dark brown, trochanters brown).

Etymology.

The specific name refers to the black trochanters of this species.