U. S. DEPARTMENT OF AGRICULTURE. 
BUREAU OF ENTOMOLOGY- BULLETIN No. 57. 
L. O HOWARD, Entomologist. 
I 
REPORT 
OH 
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SIN 
PREPARED UNDER THE DIRECTION" OF THE ENTOMOLOGIST 
BY 
E. DWIGHT SANDERSON, 
Special Agent, Bureau of Entomology, in (Joaperation with the Entomological Department, 
Agricultural and M<rhanical College of 7 
I 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE, 
L9O0. 
