Mosquitoes 



different molts, reaches maturity and transforms to a pupa in a 

 minimum of seven days in hot summer weather, taking much 

 longer in the early spring or when the weather grows cool in the 

 fall. The pupa is well illustrated in the accompanying figure and 

 differs radically from the larva or wriggler from the fact that it 

 now breathes from the ear-like or trumpet-like organs issuing 



Fig. 60. — Culex pungens : Full-grown larva at left, pupa at 

 right — enlarged. (Author's illustration.) 



from the thorax instead of from a respiratory tube at the other 

 end of the body. The pupa remains at the surface of the water 

 in an upright position but when disturbed wriggles actively to 

 the bottom, floating upwards again in a very short time. The 

 pupa stage lasts in warm weather but two days, at the expiration 



106 



