Flight and Attraction of Mosquitoes 97 



was less than eight square inches. During this 

 high infltix at Miraflores the low catch at Corozal 

 continued. The most prolific part of the interven- 

 ing production area was much nearer to Corozal 

 than it was to Miraflores. 



Is it the usual custom for this Anopheles to fly 

 against light breezes ? Is it possible that they are 

 attracted by scent? Or when the number of 

 Anopheles being produced in a limited area amounts 

 to millions, do the habits of flight to obtain blood 

 then change? These questions are exceedingly 

 difficult to answer, but as they are of the utmost 

 importance in successful and economical control 

 of Anopheles they should be investigated. 



The increase or decrease of electric lights in 

 buildings apparently does not make much difference 

 in the number of Anopheles entering. In several 

 instances, by increasing the amount of light in a 

 small experimental house at Corozal, the number 

 of Culex (species not determined) increased even 

 when vacant. When the building was empty or 

 without lights, only an occasional Anopheles 

 entered, but when one or two men were sleeping 

 in the building Anopheles crowded through small 

 openings and bit them whether the building was 

 lighted or not. 



Where buildings are well screened and Anopheles 



