SEVENTEENTH REPORT 
OF THE 
STATE ENTOMOLOGIST 
ON THE 
NOXIOUS AND BENEFICIAL INSECTS 
OF THB 
STATE OF ILLINOIS. 
SIXTH REPORT OF S, A. FORBES 
Fob the Years 1889 and 1890. 
SPRINGFIELD, ILL.: 
H. W. Rokker. State Printer and Binder. 
1891. 
