4 8 



MALARIA 



salt-marsh mosquitoes, the Anopheles are not readily 

 carried by the wind, inasmuch as they cling to vege- 

 tation as soon as a moderate breeze begins to blow. 



If the breeding place of these insects is connected 

 with human habitations by means of low herbage at 





._•:•-,. -., . . < 





Fig. 22. Receding streams leave pools of standing water along the banks, in which 

 mosquitoes breed plentifully. 



close intervals, this will afford a ready means of advance. 

 On the other hand it seems that a belt of trees tends 

 to act as a barrier. 



Hibernation. - The writer has been bitten by Anoph- 

 eles mosquitoes as early as February 12, and at 

 noonday at that, and many have been reported as 

 early as February 2d and 3d. A specimen was caught 



