288 Hominoxious Arthropods 



oo. Legs unarmed; no crossvein between the 

 branches of the radius (fig. 1636). New 



Mexico Tersesthes Townsend 



mm. R-m crossvein present. 



n. Fore femora very much swollen, armed with 



spines below, fore tibia arcuate and applied 



closely to the inferior margin of the femur. 



o. R 2 +3 present, therefore cell R r and R 2 both 



present; wing usually fasciate. United 



States Heteromyia Say. 



oo. R 2 + 3 not distinct from R 4 + 5 , hence cell 



R3 obliterated. South America 



Pachyleptus Arrib. (Walker) 



nn. Fore femur not distinctly swollen, 

 o. R 2 + 3 present therefore cells R x and R 3 

 both present, or if not, then the branches 

 of the radius more or less coalescent, 

 obliterating the cells. 



p. At least the tip of the wing with erect 

 setula?; tip of R 4 + 5 scarcely attaining 

 the middle of the wing, empodium rather 

 indistinct, not reaching the middle of the 

 claws, the claws not toothed, equal, with 

 long basal bristle; legs without stout 



setae. Widely distributed 



Culicoides Latr. 



Hsematomyidium and Oecacta are prob- 

 able synonyms of this. 



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 RI not longer than high; fork 

 of the media distad of the cross- 

 vein; wing with microscopic setu- 



lae Stilobezzia Kieff 



ss. Cell RI elongate, 

 t. Femora unarmed. Widely dis- 

 tributed. ( = Sphaeromias Kieff. 



1913 not Curtis?) 



Johannseniella Will. 



