240 The Control of Mosquitoes 



frequent inspections, and kept in close touch with 

 the daily work. 



It will be readily seen that such a system made 

 the possible mosquito producing water containers 

 disappear speedily. The number of adult Aedes 

 calopus in houses quickly decreased, and to this is 

 attributed the rapid disappearance of yellow fever 

 from Havana. 



When the work of Aedes calopus destruction was 

 commenced, it was not known how far they could 

 travel or migrate, nor was it then known that they 

 were exclusively container breeders. Culex with 

 banded legs were seen at a distance from dwellings, 

 and were reported as Aedes calopus. Little had 

 been written concerning the habits and life history 

 of mosquitoes up to that time, and it was vaguely 

 supposed that all mosquitoes were more or less 

 alike in their habits, and that all traveled long 

 distances. It was not known that Aedes calopus 

 do not breed in pools and puddles, or that the larvae 

 of this mosquito are never fotmd far from houses, 

 unless conveyed by man. As a matter of fact, we 

 occasionally find a few larvas in streams and 

 ditches, but it was not known at that time that 

 they had been washed out of containers. 



As the larvae destruction in houses and yards 

 progressed, fewer adults were observed in dwell- 



