2i6 The Control of Mosquitoes 



while ingenious, failed in its purpose — ^mosquitoes 

 simply would not enter it. Gradually by develop- 

 ing the original ideas and plans of the senior author 

 and by constant experimenting tmder his immedi- 

 ate direction, Messrs. Bath and Proctor, sanitary 

 inspectors in the Canal Zone service, evolved 

 the Anopheles trap now in use. 



This trap is essentially a labyrinth built of wire 

 gauze on a wooden framework. The illustrations 

 on pages 214 clearly show its construction, and 

 method of application to a screened window. As 

 a mosquito catcher, the trap is of great service 

 when properly used. It was found that in order 

 to catch Anopheles the traps must be attached 

 to the lee side of buildings, and that usually more 

 Culex are caught if the trap is fastened on the 

 windward side. The reason for this is yet to be 

 determined, but the phenomenon is a fact, and 

 should always be remembered when installing the 

 traps. The possibility of some species of Anopheles 

 being attracted by scent was considered. When 

 two adjacent buildings were supplied with Anophe- 

 les traps, one inhabited and the other vacant, no 

 Anopheles entered the traps attached to the vacant 

 building. 



It is foimd that more mosquitoes are caught 

 when they are attempting to enter a building. 



