Lycogaster nigralva Chen, van Achterberg & He

Holotype, female, length of body 8.9 mm (of fore wing 6.8 mm). Head. Antenna with 23 segments, segments after third segment distinctly widened and after 14th segments becoming gradually slenderer (Fig. 133); frons coarsely and rather densely punctate and vertex spaced punctate (interspaces often much wider than width of punctures) and shiny (Figs 131, 132), with short greyish setae; head subparallel-sided behind eyes, distinctly narrowed posteriorly and 1.1 times wider than mesoscutum (Fig. 132); dorsal length of eye 0.7 times length of temple (Fig. 132); temple smooth, shiny and with medium-sized whitish setae; occipital carina narrow lamelliform medio-dorsally and without crenula; supra-antennal elevations hardly developed as a thin rim and smooth; clypeus weakly emarginate and comparatively thin medio-ventrally. Mesosoma. Length of mesosoma 1.6 times its height (Fig. 137); mesopleuron below transverse mesopleural groove densely rugose anteriorly and spaced punctate and weakly shiny posteriorly, above groove densely rugose; transverse mesopleural groove narrow, deep and moderately crenulate; notauli widened, deep and coarsely crenulate; middle lobe of mesoscutum transversely rugose and weakly shiny (Fig. 138), lateral lobes densely and coarsely punctate; scutellar sulcus wide, both medially and laterally and coarsely crenulate; scutellum largely smooth (except some punctures), distinctly shiny, rather flat and anteriorly near level of mesoscutum; metanotum flat, shiny and smooth medially (Fig. 138); propodeum oblique rugulose anterio-laterally, remainder of propodeum coarsely rugose with small smooth interspaces medially and carina of foramen thick and arched (Fig. 138); foramen medially 0.8 times higher than wide basally. Wings. Fore wing: length of vein 1-M 2.1 times as long as vein 1-SR (Fig. 134). Metasoma. First tergite 0.4 times as long as apically wide, gradually narrowed basally, with shallow elliptical depression medially (Fig. 138) and flattened apically; second–fifth tergites spaced punctate (interspaces much wider than width of punctures) and rather shiny; second sternite coarsely and densely punctate, its medio-apical protuberance lamelliform and convex medio-apically (Fig. 140) and with pair of triangular submedial teeth, third sternite only with distinct ledge (Fig. 140); hypopygium truncate apically. Colour. Black (including mandible); apex of all trochanters ivory, all tarsus, tegulae, pterostigma and veins dark; pair of large lateral patches on second tergite and small patches on basal third tergite and apically on second sternite yellow; fore wing largely brown but paler subbasally (Fig. 134). Male. Unknown.

China (Sichuan).