-.^Af-^^JISgCl^S 



SCREW-WORMS AND OTHER MAGGOTS 

 AFFECTING ANIMALS 



F. C. BISHOPP 



Entomologist 

 and 



J. D. MITCHELL and D. C. PARMAN 



Entomologii-a! Assistatils 

 Southcru Field-Crop Insect Investigations 



Screw-worm fly, much enlarged. 



FARMERS' BULLETIN 857 

 UNITED STATES DEPARTMENT OF AGRICULTURE 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. 



September, 1917 



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

 Division of Publications, ITnif(»d States Department of Agriculture 



WASHINGTON ; OOVERNMENT PRINTfNQ OFFICE : 1917 



