U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN No. 111. 



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



THE HOP APHIS W THE 

 PACIFIC REGION. 



BY 



WILLIAM B. PARKER, M. S., 



Entomological Assistant. 



Issued May 6, 1913. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1913. 



