DISEASE-BEARING AMERICAN MOSQUITOES 



i:; 



Headlee, 1 there is only one brood a year, egg-laying starting when 

 many of the previous season's larvae are still small. The fact 

 that the larvae and pupae of this species get their oxygen from 

 roots under the water renders them invincible to oil. In the case 

 of this species, use of a larvicide is indicated. 



Fig. 42. — Adult of Mansonia perturbans. (After John B. Smith, New Jersey 



Agricultural Experiment Stations.) 



1, adult female; 2, part of wing vein, showing scales; 3, anterior; 4, middle, 

 and 5, posterior claws of male tarsi. All are greatly enlarged. 



Psorophora ciliata, Fabr., is one of the largest mosquitoes in the 

 United States. It lays its eggs in depressions likely to collect 

 water in time of rains. When the rains come, the eggs hatch out. 

 The larvae are very large, and feed entirely on the larvae of 

 smaller species, according to Dyar. 



1 "The Mosquitoes of New Jersey and Their Control," New Jersey Agri- 

 cultural Experiment Stations, Bull. 276, 1915. 



