280 



Amials Entomologiad Society of America [Vol. IX, 



and Culex spp. (non-anophelinse) . The Anopheles curve shows 

 double the number of these mosquitos in the N-E traps. There 

 appears to be no discrimination as to nationality of the inhabi- 

 tants of the several buildings. Emphasis is placed upon the 

 fact that north-east traps contained the bulk of the anophelenes. 

 Reference to the map shows the relation of wind direction to 

 position of traps. The Anopheles did not enter freely the S-W 

 traps because this entailed flying against considerable wind. 

 The bulk of these mosquitos flew around the lee side and entered 

 the N-E traps. This preference for the lee side of houses was 

 noted in every case where traps were present. It therefore 

 follows that entrances to buildings should always be on the 

 windward side and not on the lee side. 



The culex curve shows conditions opposite to that for the 

 anophelenes. There is no doubt whatever that the culex 

 breeding in the caison to the west of the camp supplied the influx 

 of culex, and being more powerful fliers, did not find themselves 

 forced to seek a wind-protected side. I have no positive 

 evidence of actual flight or even gradual infiltrations of culex 

 from the Cameron River northeast of the camp. 



PECULARITIES OF THE HAND CATCH DUE TO NATIONALITY OF 

 THE INHABITANTS. 



At first thought it appears improbable that the particular 

 nationality may influence the number of mosquitos that gain 

 entrance into the building. The following table is presented to 

 show what influence was observed at MiraFlores camp. 



Total Per Four Weeks' Periods, Hand Catch. 

 (Avr. per one camp, 1912.) 



Average per Day, Same Periods As Above. 



