no The Control of Mosquitoes 



The chief sanitary inspector assigned to Mr. J. 

 Zetek the task of marking mosquitoes in such 

 a manner that they could be recognized. We had 

 previously tried to induce them to mark themselves 



Table showing number of Anopheles caught in houses at Gatun 

 each week during the heavy influx 



with red ink while escaping from cages, but the 

 experiment failed. Fortunately Mr. Zetek solved 

 the problem before the influx at Gatun took place. 

 The method devised for following up the individual 

 mosqidto was as follows : 



Larvae and preferably pupae of Anopheles were 

 collected and developed into adults. These were 

 placed in cages, protected from sun or wind, and 



