Family Pelecorhynchidae

Eyes rarely hairy, male eyes holoptic, facets subequal, 3 well developed ocelli on vertex, antennae porrect and subulate, flagellum stout, stylate, primitively with 8 flagellomeres sometimes fused forming coarse, annulated stylus, first flagellomere sometimes lengthened and constricted medially, head hairs longer and denser on face and palpi, which may be wider distally

Pelecorhynchus sometimes with colorful hairs on thorax, anepimeron, meron, metapleuron except metepisternum, and laterotergite bare, the latter except for Bequaertomyia, Subscutellum strongly developed; posterior thoracic spiracle with a scale-like elevation immediately behind it

Legs strong, fore tibia with 0-1 spurs, mid and hind tibiae with 1-2 spurs. Empodia pulvilliform.

C continuing around wing, branches of R and M diverging to apical wing margin, cell R1 open and with vein R2+3 meeting C far beyond end of R1, branches of M joining wing margin far below apex of wing and without a composite ‘diagonal vein’, cell cup narrowly open at wing margin and vein A1 more or less sinuate, calypters large with fringe of hairs, upper calypter moderately large, lower calypter scarcely developed

First abdominal tergite entire.