CATALOGUE OF INSECTS. 



619 



Fig. 290.— The Hessian fly, Cecidotityia 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, flaxseed; d, 

 pupa; all very much enlarged: e, fly ovipositing on leaf, natural size; /, female; g, male fly, 

 much enlarged ; i, the parasite, Merisus destructor ; also much enlarged. 



