STATE OF ILLINOIS 



Adiai E. Stevenson, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 



Noble J. Puffer, Director 



CONTROL OF HORSE FLIES ON CATTLE 



Willis N. Bruce and George C. Decker 



\'. 



^ 



» 



Biological Notes No. 24 



Printed by Authority of the State of Illinois 



NATURAL HISTORY SURVEY DIVISION 



Harlow B. Mills, Chief 



Urbana, Illinois 



February, 195! 



