U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ENTOMOLOGY— BULLETIN No. 111. 
L. O. HOWARD, Entomologist and Chief of Bureau. 
THE HOP APHIS IN THE 
PACIFIC REGION. 
WILLIAM B. PARKER, M. S. 
Entomological Assistant. 
Issued May 6, 1913. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1913. 
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