Plate XL VII 



Prairie Species 



Corn Syrphid Fly. Mesogramma politiim. Enlarged. 

 Larva of same. Enlarged. (Sanderson, Rep. Del. Exp. Sta.) 

 Syrphid fly, SyrpJius americanus. (Metcalf, Bull. Ohio Biol. 



Snrv.)" 

 Puparium of same. (Metcalf. 1. e.) 

 Larva of same. (Metcalf, 1. c.) 

 Syrphid fly, Allograpta obliqua. (Metcalf. 1. c.) 

 Larva of same. (Metcalf, 1. c.) 



