207 



body was immediately previous thereto enveloped. The moult- 

 ing of the wheat fly maggot and the detaching of the flaxseed 

 skin by the Hessian Fly insect cannot be cited in proof that 

 these insects conform to the general rule ; because even after 

 these processes, they still retain the same shape that they had 

 before, — namely the shape at least of a larva; and the skin 

 then investing the body is not thrown off till it is converted 

 to a (scarf) pupal skin, and is cast in order to develop the 

 perfect fly. 



