INSECTS. 483 



size. When the Maggots are of full size, they change into 

 the pupa state, and remain in that state a few days ; they 



Fig. 242. Proboscis of Ho use-fly. Drawn from a preparation by Topping. (The 

 small circle encloses the same about the natural size.) 



then become Flies, soon to produce ' thousands more 



