66 THOMAS SAY FOUNDATIOX 



Genus SARCOPHAGA Meigen. 



The history of the genus is sketched in the Intro- 

 duction, and its principal characters are mentioned 

 there. Being a residual genus of vast extent, its dif- 

 ferential characters for the present purpose are main- 

 ly negative, — the absence of those which mark off the 

 smaller related genera. In the analytical tables which 

 follow, as a safeguard against mistakes by the be- 

 ginner, all the species of the minor genera are in- 

 cluded, except those of the strongly-marked ones 

 Phrissopodia, Wohlfahrtia and Johnsonia. 



Table of Groups. — Males. 



Three distinct postsutural dorsocentrals 



Hind tibije with villosity (at the minimum 

 there are at least a few erect, slender hairs 

 that are longer than the diameter of the 

 tibia) 



Hypojiygium wholly black 



(p. 67) Group A. 



At least its second segment red 

 (p. 74) Group B. 



Hind tibiae not with erect villosity (at the ut- 

 most with appressed hairs) 

 Hypopygium wholly black 



(p. 94)" Group C. 



At least its second segment red 

 (p. 113) Group D. 



Four postsutural dorsocentrals, or else the anterior 

 ones of the postsutural series indistinct, hardly 

 differentiated from hairs. 



Hind tibiae with villosity (as limited above) 

 Hypopygium wholly black 



(p. 162) " Group E. 



At least its second segment red 

 (p. 174) Group F. 



