Hominoxious Arthropods 



00. 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. R2+3 present, therefore cell Rr and R2 both 



present; wing usually fasciate. United 



States Heteromyia Say. 



00. R2+3 not distinct from R4+5, hence cell 



R3 obliterated. South America 



Pachyleptus Arrib. (Walker) 



nn. Fore femur not distinctly swollen. 



o. R2 + 3 present therefore cells Rj and R3 



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 



setulae; tip of R4+S 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 



setas. 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 KieflE 



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 Rj elongate, 

 t. Femora unarmed. Widely dis- 

 tributed . ( = Sphaeromias Kieff . 



1913 not Curtis?) 



Johannseniella Will. 



