Plate XL VII 



Prairie Species 



Fig. 1. Corn Syrphid Fly, Mesogramma poliium. Enlarged. 



Fig. 2. Larva of same. Enlarged. (Sanderson, Rep. Del. Exp. Sta.) 



Fig. 3. Syrphid fly, Syrphus americanus. (Metcalf, Bull. Ohio Biol. 



Surv.) 



Fig. 4. Puparium of same. (Metcalf, 1. c.) 



Fig. 5. Larva of same. (Metcalf, 1. c.) 



Fig. 6. Syrphid fly, Allograptd obliqua. (Metcalf, 1. c.) 



Fig. 7. Larva of same. (Metcalf, 1. c.) 



