SB 

 818 

 C578 

 ENT 



Issued January 27, 1912. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— CIRCULAR No. 143. 



L. O. HOWARD. Entomologist and Chief of Bureau. 



INSECT DAMAGE TO STANDING TIMBER 

 IN THE NATIONAL PARKS. 



A.^^. HOPKINS, 



In Charge of Forest Insect Investigations. 



WASHINGTON : GOVERNMENT IMIINTINC OFFICE : 1912 



19240°— Cir. 143—12 





