Cheiromyia

Key to species of Cheiromyia (males)

1 Postpedicel with one elongate projection on outer surface (Fig. 1 A); antennal color entirely dark brown; face dark brown and narrow; femora infuscated (Fig. 3 B) (Brazil: Amazonas) ..................................... bicornis Brooks sp. nov.

- Postpedicel with several digitiform projections on outer surface (Figs. 1 B–D); scape, pedicel and base of postpedicel pale, at most infuscated dorsally; face silvery white or opaque yellow, width various (Figs. 2A–C); femora pale..... 2

2 Postpedicel triangular and elongate, about 4x as long as wide (Figs. 1 C,D), evenly tapering to apex, with 10–11 digitiform projections on outer surface; face opaque yellow, broad (Fig. 2A); wing with brownish tint (Fig. 2E) (Bolivia, Brazil) .......................................................................................................................... pennaticornis (Parent)

- Postpedicel subovoid basally with narrowed elongate apex, about 2x as long as wide, with 3–5 digitiform projections on outer surface (Fig. 1 B); face silver, relatively narrow (Figs. 2B,C); wing hyaline (Fig. 2D)......................... 3

3 TI not swollen, tarsus I lacking pronounced outward bend, It2 slightly longer than It3, It3–4 lacking row of erect setae on inner margin; cercus triangular, large (Fig. 6A); face narrow (Fig. 2C) (Ecuador, Brazil, Surinam, French Guiana).................................................................................................................................................. palmaticornis (Parent)

- TI slightly swollen, tarsus I with pronounced outward bend and It2 shorter than It3 (Fig. 4 A), It3–4 with row of erect setae on inner margin, setae more closely set on It4; cercus ovoid or subquadrate (Figs. 4 B, 5A); face wider (Fig. 2B)..................................................................................................................................................................................... 4

4 Left apv epandrial lobe lacking acute apicodorsal projection; (Fig. 4 B); face relatively narrow (Fig. 2B) (Colombia, Guyana, French Guiana, Brazil) .......................................................................................... brevitarsis Brooks sp. nov.

- Left apv epandrial lobe with acute apicodorsal projection (Fig. 5 A); face wider (Costa Rica)..................................... .................................................................................................................................................. laselva Brooks sp. nov.