Lygistorrhina cerqueirai (after Lane, 1958)
Male. - Head: Proboscis about three fourths the length of abdomen, very slender and yellowish. Clypeus and palpus riot seen due to position of head in mounting. Eyes very much emarginate and occupying most of the head leaving a very narrow blackish front. Ocelli three, the lateral ones contiguous to eye, the mesial one smaller. Antenna with yellowish scape; flagellurn filiform. nearly one and a half times tlie length of mesonotum, yellow with hirsute yellow hairs. Occiput much restricted, brown with slender and long hairs. Thorax: Anterior pronoturn yellowish with five weak setae, its episternuln with six seta mesonotum reddish brown with indistinct slightly darker markings indicating a pattern, margins yellow; covered with very sparse hairs except over the root of wing where they are longer, with two prescutellar setae. Scutellum dark brown with short marginal setae. Postnotum brown. Pleura with yellow posterior pronotum; anepisternite dark brown but its upper margin yellow; katepisternite dark brown in the middle but above and below yellow; pteropleurite brown; pleurotergite blackish brown, its posterior margin ridged and with three long setae. Wing with veins and markings. Haltere yellow. Legs: Fore coxa yellow; mid coxa yellow in the middle but blackish over the rest; hind coxa blackish. Fore femur yellowish; mid femur yellowish with a brown tinge; hind femur blackish and thickened in the middle. Fore tibia yellowish, tinged lightly with brown and ending in a short yellow spur; mid tibia as fore tibia and also ending in a single spur; hind tibia brownish, its apical fourth thickened ancl blackish, ending in two longish hlackish spurs. Fore basitarsus about one fourth longer than its respective tibia; mid hasitarsus two thirds the length of its tibia; hind basitarsus slightly more than half the length of its tibia. Tarsi of fore ancl mid legs brown, of hind legs thicker due to blackish, shaggy hairs. Claws two, slender. Abdomen very slender, elongate, about five times the length of the mesonotum. Segments I-VI blackish with broad yellow apical bands, VII to apex completely blackish. Genitalia blackish. Basistyle longer than wide, attenuated to apex. Dististyle simple, two thirds the length of basistyle, thickened apically and ending in a stout, blunt tooth on the upper internal angle; covered with short hairs and some long setae. Ninth tergite very large and nearly as long as the basistyle.
Male. - Length of body 4.8 mm, wing 2.7 mm.