inn 
U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ENTOMOLOGY— BULLETIN No. 83, Part I. 
L. O. HOWARD, Entomologist and Chief of Bureau. 
*(?</t/S 
PRACTICAL INFORMATION ON THE SCQLYTID BEETLES 
OF NORTH AMERICAN FORESTS. 
JAN 2 s 
I. BARKBEETLES (ff THE GENUS 
DENDROCTOftTJS:*" ' 
BY 
A. D. HOPKINS, Ph. D., 
In Charge of Forest Insect Investigations. 
Issued October 11, 1909. 
** 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1909. 
