Subgenus Exallomyia Harbach & Peyton, 1992

ADULTS ‒ Not much differentiated from the adults of other subgenera of Wyeomyia, which are diagnosed principally on morphological features of the male genitalia and larvae; paratergal scales and mesopostnotal setae present; lower mesokatepisternal setae not extending above dorsal margin of mesomeron; upper calypter of wing with 1 or 2 marginal setae. MALE GENITALIA ‒ Tergum IX without lobes, with closely approximated rows of setae; gonocoxite with a prominent tergomesal group of setae, gonostylus with flap-like lobe C; aedeagus narrow, distinctly longer than wide; apical tergal arms not joined; proctiger normal, cercal setae present. LARVAE ‒ Seta 6-C inserted anterior to seta 7-C; seta 1-A multi-branched, inserted at or before mid-length of antenna; maxilla broad, without apical tooth, seta 4-Mx strongly developed, longer than maxillary brush, split at apex, hypostomal sclerite absent, maxillary palpus small, seta 6-Mx inserted on basal margin of maxillary body; seta 14-C very strongly developed, significantly longer than seta 15-C, inserted anterior to 15-C on level with seta 12-C; seta 1-P multi-branched, much shorter and inserted well mesad and distinctly caudad of setae 2,3-P; seta 4-P long, double; seta 11-P,M,T well developed, with multiple branches; seta 7-M not strongly developed, single; seta 4-T developed like seta 1-T; seta 8-T inserted laterally between sclerites bearing seta 7-T and setae 9‒12-T; seta 13-T very strongly developed, longer than length of thorax; seta 1-I,II well developed, multi-branched, developed like seta 2-III‒VII, seta 1-III‒VI very long, single, borne on basal plate; seta 2-I‒VII well developed, with multiple branches, seta 2-III‒VII inserted mesad and on same level or slightly posterior to seta 1; seta 9-I‒VI well developed, with multiple branches; setae 7,13-II inserted more or less on same level, 13-III‒VI inserted distinctly posterior to seta 7; comb plate absent, ventral comb scales small, fringed with spicules, becoming larger and progressively spine-like dorsally; siphon without pecten, seta 1-S inserted near base of siphon, setae la,2a-S each in more or less straight row; seta 4-X developed like setae 1‒3-X, very long, single or double. PUPAE ‒ Cephalothorax and abdomen without spots; trumpet slightly flattened, not laterally expanded, pinna shorter than greatest width of meatus; seta 1-I strongly developed, with numerous dendritic branches; seta 2-II‒VII inserted near posterior margin of terga, 2-II,VII inserted lateral to seta 1, 2-III‒VI inserted mesal to seta 1; seta 3-III inserted mesad of seta 1, 3-VII more or less in line with seta 1; seta 6-II variable, slightly shorter to longer than segment III, seta 6-VII inserted on tergum caudomesad of seta 9-VII; paddle long, length about 1.5x width, apex fringed with minute spicules. See genus Wyeomyia.