A. D. Imms and M. a. Husain 



281 



tropic properties or, possibly, some smell is emitted by the flies themselves 

 and their faeces, and serves to attract further individuals. The importance 

 of using perfectly clean traps is thus rendered particularly important. 

 The traps were suspended from trees and posts at a height of 2-4 feet 

 from the ground. Owing to the junior author (Husain) having at his 



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