207 



body was immediately previous thereto enveloped. The moult- 

 ino- 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 oflp till it is converted 

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

 perfect fly. 



