Ismarus nigritrochanter Haliday 1835

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; scutellumsmooth, 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.

China (Yunnan).