Carpenter et al. : Mosquitoes of Southern U. S. 



233 



Breeding occurs throughout the year in the extreme South but is more com- 

 mon from May to October farther north. 



MEDICAL IMPORTANCE. — Aedes vexans has been shown through laboratory 

 experiments to transmit both the eastern and western varieties of equine enceph- 

 alitis. Feemster and Getting (60) state that it is not unhkely that this species 

 may prove to be the most important natural vector of this disease. The virus 

 of St. Louis encephahtis has also been successfully transmitted by Aedes vexans 

 in the laboratory (74). 



£ KA i-ran 



Fig. 128. Larva of Aedes vexans (Meigen). A, Terminal segments. 

 B, Comb scale. C, Pecten tooth. D, Head. 



