Airplane Dusting in Control of Malaria Mosquitoes 15 



of this method of control in breeding areas of the type represented, 

 the lakes being overgrown with aquatic vegetation and having an 

 abundance of Anopheles larvae well distributed throughout. In the 

 first of these a larval reduction of 88 per cent occurred as a result 

 of the treatment, and in the second over 99 per cent were killed, as 

 estimated by the writers' method of examination. The only larvae 

 remaining in the second instance were a few of the smallest size, 

 which were found in one small spot. In each test a series of pans 

 containing a counted number of larvae were distributed over the 

 lake as a further check on the effectiveness of the poisoning. In the 

 first test 92 per cent of these larvae were killed and in the second all 

 were destroyed. 



