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. 
