Bulletin No. 21, New Series. 



U. S. DEPARTMENT OF AGRICULTURE, 



DIVISION OF EXTOJIOLOGY. 



PRELIMINARY REPORT 



Insect Enemies of Forests in the Northwest. 



AN ACCOUNT OF THE RESULTS GAINED FROM A RECONNAISSANCE 

 TRIP MADE IN THE SPRING AND EARLY SUMMER OF 1899. 



PREPARED TTNDER THE DIRECTION OF THE ENTOMOLOGIST 



A. D. HOPKINS, Ph. D., 



Vice-Director and Entomologist of the West Virginia 



Agricultural Experiment Station. 



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WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1899. 



