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THE HORN FLY OF CATTLE, 



{Hcematobia serrata R. Desv.) 



An account of "the Horn Fly of Cattle" was given as an 

 appendix to Mr. Kellogg's pamphlet on the "Common Injurious 

 Insects of Kansas" published by the State for free distribution 

 in Kansas. This account of the Horn Fly was written in the 

 belief that this rapidly-spreading pest would soon come to be 

 one of the conspicuous injurious insects of the State. Since 

 writing the account so many reports of the pest's certain presence 

 in Kansas have been received, pointing to its probable local 

 occurrence in serious numbers this summer, that it has been 

 considered desirable to issue a special bulletin of warning, 

 information and inquiry regarding this cattle pest. 



The horn fly is a small, black, two -winged gnat, about one-sixth 

 of an inch long, which derives its name from its habit of cluster- 

 ing around the bases of the horns of cattle. When gathered on 

 the horns the flies are merely resting, and are doing no damage 

 to the horns. When feeding, the flies are found over the back 

 and flanks and on the legs of the cattle, where they are 

 industriously engaged in sucking blood. 



Horn with flies clustered around its base. [After Riley] 



