pp. Wings bare, if rarely with hair, then the radius reaches beyond two-thirds the length of the wing, or the femur or fifth tarsal segment with stout black spines. q. Media unbranched. Europe. _Brachypogon_ Kieff qq. Media branched. r. Hind femur much swollen and spined. America and Europe. _Serromyia_ Meg. rr. Hind femur not distinctly swollen. s. Cell R_1 not longer than high; fork of the media distad of the crossvein; wing with microscopic setulæ _Stilobezzia_ Kieff ss. Cell R_1 elongate. t. Femora unarmed. Widely distributed. (= Sphaeromias Kieff. 1913 not Curtis?). JOHANNSENIELLA Will. tt. Femora, at least in part, with strong black spines. Widely distributed. _Palpomyia_ Megerle oo. R_{2+3} coalescent with R_{4+5} hence cell R_3 is obliterated. p. In the female the lower branch of the media with an elbow near its base projecting proximad, the petiole of the media coalescent with the basal section of the radius, wing long and narrow, radial sector ending near the tip of the wing; venation of the male as in _Bezzia_; front concave. United States. _Stenoxenus_ Coq. pp. Venation otherwise, front not concave. q. Subcosta and R_1 more or less coalescent with the costa; wing pointed at the apex, much longer than the body; antennæ fourteen segmented, not plumose. India. _Haasiella_ Kieff. qq. Subcosta and radius distinct from the costa.