INSECTS 



mosquito larvae got into it — that was the charm of the 

 barrel; we could believe that we stood face to face with the 

 great mystery of the origin of life. Now, of course, we 

 understand that it is a very simple matter for a female 



Fig. 174. Life stages of a mosquito, Culex quinquejasciatus 



A, the adult female. B, head of an adult male. C, a floating egg raft, with 



four eggs shown separately and more enlarged. D, a young larva suspended 



at the surface of the water. E, full-grown larva. F, the pupa resting against 



the surface film of the water 



[33°] 



