Psilopini

Savaris, Marcoandre, Marinoni, Luciane & Mathis, Wayne N., 2016, Revision of the shore-fly genus Peltopsilopa Hendel (Diptera: Ephydridae), Zootaxa 4083 (1), pp. 83-98 : 85

Key to genera of Psilopini from South America

1. Scutellum greatly enlarged, extended over and beyond posterior of abdomen....................... Peltopsilopa Hendel

- Scutellum normally developed, not extended posteriorly far over abdomen........................................ 2

2. Base of wing blackish, contrasting with remainder of wing.................................... Cressonomyia Arnaud

- Base of wing concolorous with rest of wing, usually hyaline or very lightly tinged.................................. 2

3. Antenna with pedicel conical, broader apically, without dorsoapical lobe, with dorsoapical spine weak and at most 1/3 as long as basal flagellomere; basal flagellomere from 2‒ 4X as long as wide............................. Ceropsilopa Cresson

- Antenna with pedicel short and subtriangular, with dorsoapical lobe, with dorsoapical spine strong and at least half as long as basal flagellomere; basal flagellomere at most 2X as long as wide............................................... 4

4. Vein R2+3 close to costa beyond end of vein R1; crossvein dm-cu with sharp angle at middle........... Clanoneurum Becker

- VeinR2+3 well separated from costa; crossvein dm-cu mostly straight or shallowly arched, not angulate.................. 5

5. Face smooth, lacking transverse striae.......................................................... Psilopa Fallén

- Face with transverse striae............................................................. Leptopsilopa Cresson