DiV. INSECT? 



THE HOUSE FLY 



L. 0. HOWARD 



Chief of the Bureau of Entomology 

 and 



R. H. HUTCHISON 



Scientific Assistant 



FARMERS' BULLETIN 851 

 UNITED STATES DEPARTMENT OF AGRICULTURE 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. ' August, 1917 



Show this bulletin to a neighbor. Additional copies may be obtained free from the 

 Division of Publications, United States Department of Agriculture 



yVASHINOTON : OOVERNMENT PRINTINQ OFFICE : l»IT 



