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Technical Series No. 25, Part II. 



U. S. DEPARTMENT OF AGRICULTURE, 



HJJltmA.TT OW EN'rOMOLOGJ-Y. 



L. 0. HOWARD, Entomologist and Chief of Bureau. 



PAPERS ON APHIDlDJi:. 



THE YELLOW CLOVER APHIS. 



BY 



J. J. DAVIS, 



EntomolDgical Assistant, Cereal and Forage 

 Insect Investigations. 



Issued Novembek 12, 1914. 



WASHINGTON: 



GOVERNMENT PRINTING OFFIfK. 



1914. 



