U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ENTOMOLOGY— BULLETIN No. 117. 
L. O. HOWARD, Entomologist and Chief of Bureau. 
THE RED SPIDER ON HOPS 
IN THE SACRAMENTO VALLEY 
OF CALIFORNIA. 
BY 
WILLIAM B. PARKER, M. S., 
Entomological Assistant. 
Issued May 3, 1913. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1913. 
