1 14 The Control of Mosquitoes 



Considering the small number that were stained 

 compared with the enormous number that took 

 part in the Gatun flights, it was not to be expected 

 that many stained specimens would be recaptured. 

 Forty stained specimens were recovered at dis- 

 tances varying from 1200 to 6250 feet from the 

 liberation station: 



2 between 1000 and 2000 feet distant 



At the time of the staining the Anopheles 

 tarsimaculata was the most numerous species, 

 although Anopheles albimanus and Culex were 

 present both at the breeding place and in the 

 flight. Among the specimens recovered, thirty- 

 three were Anopheles tarsimaculata; five Anopheles 

 albimanus; one Culex, and one undetermined. 

 Some of them were captured in mosquito bars 

 under houses. Of the five that made the longest 

 flight, four were Anopheles tarsimaculata and 

 one Anopheles albimanus. They were caught by 

 an observer under a net placed in the shade of a 

 building 6250 feet from the liberation station. 



