UNITED STATES DEPARTMENT OF AGRICULTURE 



Miscellaneous Publication No. 273 



Washington, D. C. 



Issued February 1938 

 Revised July 1952 



Insect Enemies 

 Of Western Forests 



By 



F. P. KEEN 



Entomologist 



Division of Forest Insect Investigations 



Bureau of Entomology and Plant Quarantine 



UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASHINGTON : 1952 



For sale by the Superintendent of Documents, U. S. Government Printing Office 

 Washington 25, D. C. - Price $1 (paper cover) 



