ILLUSTRATIONS. 



(Photographs by W. H. Boynton.) 



Plate I. Screened stable for fly experiments with horses. The 

 outer door is open to show the interior of the fly-trap 

 vestibule. 

 II. Immobilized guinea pig in a large museum jar for experi- 

 ments with great numbers of flies. 



III. Illustrating method of applying an unlimited number of 



Stomoxys to the monkey's tail inclosed in a large bottle. 



IV. Illustrating the feeding of Stomoxys in inverted tubes on 



immobilized monkey. 

 V. Showing single tube application of Stomoxys on a guinea 



pig. 



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