i62 AGRICULTURAL EXPERIMENT STATION. 



pool so insignificant nor stream too rapid but that somewhere in 

 it Anopheles can breed. Nor need the water be either fresh or 

 clean. The larva of A. mactdipennis has been found on the salt 

 marsh and I have taken that of punctipennis in a stream that was 

 little better than an open sewer. Ordinarily the larvae occur 



Figure 45. 



Anopheles punctipennis ; i, female adult; 2, her palpus; 3, genitalia; 4, part of wing 

 vein showing scales; 5, anterior and 6, middle claws of male: all much enlarged. 

 (Original.) 



singly, or in small numbers at one point ; but occasionally they 

 appear in numbers rivaling those of Culex. Small creeks through 

 meadow land, the ditches and gutters or drains along railroad 

 and other embankments, and the shallow overgrown edges of 



