U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN No. 110. 



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



THE SPRING GRAIN- APHIS OR 



"GREEN BUG." 



BY 



F. M. WEBSTER, 



In Charge of Cereal and Forage Insect Investigations, 

 AND 



W. J. PHILLIPS, 



Entomological Assistant. 



Issued September 6, 1912. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1912. 



