Key to genera of Stenopogoninae without, or with poorly developed, pulvilli

1 Abdomen broad and dorsoventrally compressed (width:length ratio of T2>2)...2

– Abdomen cylindrical, not obviously dorsoventrally compressed (width:length ratio of T2 <1.5)........................................................................................................4

2 Costal vein extending around wing tip, terminating at a point where CuA 2 and A 1 reach wing margin; cells r 5 and m 3 open at wing margin.......................................3

– Costal vein falling short of juncture of CuA 2 and A 1; cells r 5 and m 3 stalked, the stalks frequently failing to reach the wing margin......... Sisyrnodytes Loew, 1856

3 Cell m 3 open; vein R 4 usually with basal stump-vein; pulvilli poorly developed, but clearly discernable; hypandrium somewhat flat or only gently concave ................. ........................................................................................... Acnephalomyia gen. n.

– Cell m 3 closed and stalked; vein R 4 lacking basal stump-vein; pulvilli minute and difficult to detect; hypandrium distinctively cup­shaped........ Astiptomyia gen. n.

4 Small flies (wing length <3.5 mm); empodia apparently absent; vein R 4 lacking basal stump-vein; macrosetae of mesonotum greatly developed, many times longer than accompanying setae ........................................... Ammodaimon Londt, 1985

– Larger flies (wing length>6.0 mm); empodia well developed; vein R 4 with basal stump-vein; macrosetae of mesonotum moderately developed, not many times longer than accompanying setae ............................. Sporadothrix Hermann, 1907