Lygistorrhina carayoni Matile, 1986

Male: Head brownish-black. Three ocelli, the lateral large, distant from the edge of the eyes by about twice their own diameter, the median smaller. Antennae: scape and pedicel yellow-orange, flagellum brown-black. Face and proboscis yellow-orange, the latter brown at the apex and reaching almost three times the length of the first pair of coxae.
Thorax: prothorax yellow-orange, slightly browned in the middle. Scutellum and mediotergite brown-black. Pleural sclerites brown.
Legs: anterior coxa yellow, mid and posterior coxae brown. All femora yellow, the hind femora brown at apex. Tibiae yellow, overshadowed by the ciliation, tibia III brownish at apex closely and regularly thickened from base to apex. Spurs black-brown. Tibia I spur slightly shorter than the apical width of the corresponding tibia. The outer spur of tibia II very small, spiniform; inner one long, reaching three times the apical width of tibia. External spur of tibia III double the apical width of tibia, internal one - triple. Tibial setae arranged in regular rows. Tibiae I without bristles, tibia II with it some bristles anteriorly, tibia III with widely spaced anterior and posterior bristles located only on the apical third of the tibia. Tibia I with a small comb anteriorly, II and III with well-developed anterior and posterior combs. Tarsi brown-black, the fore and mid filiform, the hind tarsi thicker and shorter. Protarsus I as long as corresponding tibia.
Wings grayish brown between the Costa and R5, except at the base, well browned all over the apical quarter, and the posterior margin to Cu1b, but without forming a well-defined spots. Remaining part of M4 roughly the same length as the remainder of M 1. Halteres yellow.
Abdomen elongate, filiform, uniformly brown-black.
Hypopygium brown-black except the yellow cerci and hypoprocte and black apex of gonostyli. Tergite IX narrow, elongate ovoid, with a tight brush of apical spinules. Gonocoxopodites widely divergent, ventral area separated by a membranous triangular, narrow but extended nearly to the base of gonocoxal synsclerite, lacks modified setae. Gonostyli simple, toothed at the apex and with an apical brush of thicker and more densely packed setae, with a pair of long setae internally.

Female similar to male, but the proboscis nearly four times the length of the anterior coxa. Coxae brown. Abdomen shorter and wider, flattened dorsoventrally. Ovipositor brown.