U.S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ENTOMOLOGY—BULLETIN No. 73. 
L. O. HOWARD, Entomologist and Chief of Bureau. 
STUDIES OF PARASITES OF THE 
COTTON BOLL WEEVIL. 
BY 
W. DWIGHT PIERCE, 
Special Field Agent. 
IssuED JANUARY 21, 1908. 
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WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1908. 
