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



223 



by Carpenter (30) in Arkansas during February, March, and September 

 through December. 



medical importance. — During 1939, workers at the Harvard Medical 

 School demonstrated in the laboratory that A. atropalpus can transmit the 

 eastern variety of equine encephahtis. They concluded, however, that it is 

 probably not an important natural vector of the disease due to its peculiar 

 geographical distribution and to the small number of specimens ordinarily 

 encountered. 



Fig. 122. Larva of Aedes alropalpus (Coquillett). A, Terminal 

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



