l. Arista long plumose, or pectinate above; oral

vibrissae present; anal cell complete; costa broken at the apex of R_1. DROSOPHILA, PHORTICA, and other genera. DROSOPHILIDAE

ll. With another combination of characters.

m. The cell M and first M_2 not separated by a crossvein; anal cell absent; front bare or only bristly above; usually light colored flies. HIPPELATES, OSCINUS, and other genera. (See also m m m.) OSCINIDAE

mm. Cell M and cell first M_2 often separated by a crossvein; anal cell present, complete, though frequently small; scutellum without spines or protuberances; oral vibrissae present; arista bare or short plumose; front bristly at vertex only; small dark flies. PIOPHILA (fig. 99), SEPSIS and other genera. SEPSIDAE