Fig. 386. 



The Hessian-fly, Cccidomyia drstructor— On the left a healthy sta'k of wheat, and on the 

 right one infested at h by Hessian-fly, showing the galls, a, egg ; b, larva ; c. " flaxseed ;" 

 d, pupa, all very much enlarged ; e, fly ovipositing on leaf, natural size ; /, female, and j; , 

 niale Hessiau-fly, much enlarged ; t, the parasite, Merisus destructor, much enlarged. 



22 



537 



