Subfamily Brachyrhopalinae

Genera found in Wyoming: Cyrtopogon, Eucyrtopogon, Heteropogon, and Holopogon .

Key to Genera [adapted from Nelson (1987); Wood (1981)]

1 Wing with brown (dark) spots at crossvein r-m, at bifurcation of R 4 and R 5, and at apex of cell d, other spots also may be present; bifurcation of R 4 and R 5 proximal to or level with apex of cell d....................................... Eucyrtopogon

- Wing hyaline or darkened (infuscated), or if brown spots are present (some Cyrtopogon and Heteropogon), not in the three positions given above; bifurcation of R 4 and R 5 distal to apex of cell d............................................ 2

2 Face strongly convex or inflated, when viewed from side extending greater than length of antennal scape past eye margin; dorsocentral bristles of thorax setae like or lacking; moderate to abundant pile on scutum.................... Cyrtopogon

- Face flat or slightly convex; dorsocentral bristles well developed, prominent; little or no pile on scutum................. 3

3 Hind tibiae much enlarged, as thick as or thicker than hind femora; CuA 2 and A 1 joined before wing margin..... Holopogon

- Hind tibiae thinner than hind femora; CuA 2 and A 1 ending separately in wing margin....................... Heteropogon