74 



3I0SQUIT0ES 



trumpet-shaped breatliiDg- org-ans, which now issue from 

 the thorax and no longer from the abdomen as with the 

 larva. In Culex pimgens, these ear-shaped, trumpet-like 



Fig. 11. — Adult male of Ciilex pungens; with parts enlarged. (Author's 

 illustration.) 



breathing" organs are rather slender and of the propor- 

 tions indicated in the figure. 



The duration of the pupal stage in midsummer with 

 this species at Washington is about two days. A mini- 

 mum generation, therefore, of Culex pimgefis will occupy 

 ten days, as follows : sixteen to twenty-four hours for the 

 egg ; seven days for the larva, and two days for the pupa. 



