Lygistorrhina insignis (after Skuse, 1890)
Head black, small, rounded, narrower than the thorax; exerted from the thorax; front rather narrow. Eyes large, approximate beneath. Ocelli three, arranged in a small triangle on the vertex, the anterior one very small. Proboscis rather more than half the length of entire body, sordid ochreous, growing dusky towards the tip. Palpi (apparently) wanting. Antennae black, porrected, cylindrical, short, 2+14 jointed; flagellar joints longer than broad, progressively diminishing in thickness, with a microscopic pubescence.
Thorax short, ovate, very gibbose; scutellurn small; metanotum large, acclivous. Thorax deep brown, opaque, covered with very short black hairs; pleurae somewhat shining. Halteres yellow.
Abdomen black, somewhat shining, slender, somewhat compressed from the sides, narrowed at the base and extremity, seven-segmented, clothed with short black hairs, the third, fourth and fifth segments bordered anteriorly with ochraceous; terminal lamellae of the ovipositor elongate-elliptical, yellow. Legs long and slender; coxae somewhat elongate, as in Sciara; fore and intermediate femora slender, the hind pair dilated, a little longer than the other pairs; fore and intermediate tibiae and tarsi very slender ; hind tibiae incrassated towards the apex, nearly twice the length of the fore pair; hind tarsi thicker than those of the other legs. Fore tibiae with one, intermediate with two very small spurs; hind pair with two unequal spurs; no lateral spines.
Legs with a dense microscopic pubescence. Coxae deep brown, the anterior pair sordid ochreous. Femora ochreous; the hind pair broadly flattened, longer than the others, with almost the apical half deep brown or black. Tibiae sordid ochreous; the hind pair almost twice the length of the anterior pair, gradually thickened towards the apex, deep brown or black at the apex. Tarsi black; the metatarsus in the hind-legs nearly the length of the remaining joints taken together. Wings shorter than the abdomen, moderately broad, rounded off at the base, incumbent in repose; microscopically pubescent.
Wings hyaline, with a pale greyish cloud above the fork of the fifth longitudinal vein, and the apex infuscated with greyish; brilliantly iridescent; veins deep brown. Costal vein extending much beyond the tip of the third longitudinal vein, but not reaching the apex of the wing; auxiliary vein incomplete, very short, close to the first longitudinal; first longitudinal vein short, reaching the costa considerably before the middle of the wing; second longitudinal wanting, possibly represented by a pale vein-like vein; fourth longitudinal incomplete, the petiole and base of fork wanting; fork of fifth longitudinal vein small, the anterior branch detached at the base; sixth longitudinal vein very rudimentary. incrassation between the first longitudinal vein and the base of the third longitudinal; no cross-vein between the longitudinal veins; third longitudinal vein originating at the base of the wing, tolerably straight, terminating in the costa opposite the tip of the posterior branch of the fork of the fourth longitudinal.
Length of antenna - 0.84 mm
Expanse of wings - 2.39 X 0.90 mm
Size of body - 3.30 X 0.43 mm