728 REPORT OF NEW JERSEY STATE MUSEUM. 



Fig. 297.- The Hessian fly, Mayetiola destructor: on the left a healthy stalk of wheat 

 and on the right one infested at h by the "fly," showing galls; a, egg; b, larva; c, flax- 

 seed; d, pupa; all very much enlarged; c, fly ovipositing on leaf, natural size; f, female; 

 g, male fly, much enlarged; i, the parasite, Merisus destructor; also much enlarged. 



