OF WASHINGTON, YOM.'MK XII, l!t|i). 



Only dates on which mosquitoes are active are given above. 

 They are here the entire year and bite in warm weather, even 

 in December and January. 



Mr. Busck said that the finding of Megarhinus males abun- 

 dant without finding any females was not new; this had already 

 been recorded by Mr. Knab. In Dublin, N. H., during the 

 season of 1909, at least 99 per cent of the larvae of Mansonia 

 pertnr/xni* were attacked by mites. This species of mosquito 

 in the above locality was breeding in only a few localities, but 

 nevertheless it was to be found everywhere. 



