Khaghaninia & Gharajedaghi, 2014:
Diagnostic characters: This genus differing with similar species by these characters: Antennal stylus rarely pale pubescent, Antennal postpedicel mainly yellow, darkened in dorsal sides and apex, palpi yellow, fore basitarsus with ventral rows of pale setae, ocellars triangle and abdomen dark brown, notum mainly yellow, notopleural with dark patch, legs mainly yellow with dark tarsus. Genus Oxypsila closely related to the genus Psila and differing by lack dorsocentral (prescutellar acrostical) bristles (Matthias & Marshall 2006, Freidberg & Shatalkin 2008).
There is a key in the above paper but it's against just a few Iranian Psilidae.
Key: Collin, 1944