INSECTS AFFECTING MAN AND ANIMALS 185 



hanging from the surface of the water, through which they 

 breathe by means of a long air-tube attached to the tip of 

 abdomen, while those of the malarial mosquitoes lie parallel 



a 



FIG. 131. A malaria mosquito (Anopheles quadrimaculatus) . 

 Howard, U. S. Dept. Agr.) All greatly enlarged. 



o, eggs; 6, larva; c, pupa; d, male, and e, female adults. 



(After 



to the surface and do not have the air-tube. When grown 

 the larvae change to the curiously shaped pupae (Fig. 131), 

 which have breathing tubes attached to the thorax. In hot 



