Bulletin No. 21, New Series. 



U. S. DEPARTMENT OF AGRICULTURE, 



DIVISION OF ENTOMOLOGY. 



PRELIMINARY REPORT 



ON THE 



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 UNDER THE DIRECTION OF THE ENTOMOLOGIST 



A. D. HOPKINS, Ph. D., 



Vice-Director and Entomologist of the West Virginia 



Agricultural Experiment Station. 



WASHINGTON- 

 GOVERNMENT PRINTING OFFICE, 

 1809. 



