flff r¥M 



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 



