Onirion Peyton & Harbach, 2000

Adults of Onirion are similar to Wyeomyia in overall ornamentation, but the pale markings on the mid- and hindtarsi are quite characteristic of members of the genus. The midtarsus has bright white scaling on the anterior surface from the middle of tarsomere 2 through tarsomere 5 and the hindtarsus has similar scaling ventrally from the middle of tarsomere 3 through tarsomere 5. The cercal setae of the male genitalia are extremely long and distinctive of the genus, and the collection of long tergal setae on the gonocoxites (except in one species) is an unusual feature that occurs in few other sabethine taxa. Larvae of Onirion have a circular occipital foramen (distinction from Isostomyia, Limatus, Sabethes, Runchomyia and most Wyeomyia) but are otherwise easily distinguished from the larvae of all New World genera by the predominance of aciculae on one side of the branches of seta 4-P and seta 7-T, the stout apically spiked seta 11-T, the placement of strongly developed seta 13-IV,V laterad of setae 11 and 12, and the presence of a dense filamentous pecten extending the length of the siphon. Pupae have punctures only on terga III and IV, a noticeable pair of scar-like depressions borne centrally on terga II–VII, and terga I–VII are largely darkly pigmented centrally with little or no pigment around the bases of many setae. See Sabethini.