LETrHR OF TRAXSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Entomology, 

 ^\^asMngton, D. C, March 31, 1909. 



Sir: I have the honor to transmit herewith manuscript of the 

 first part of a proposed buUetm of this bureau, to be entitled "Practical 

 Information on the Scolytid Beetles of North American Forests." 



The present part is entitled "Barkbeetles of the Genus Dendroc- 

 tonus," and deals with the more practical results of extensive inves- 

 tigations by Doctor Hopkins between 1891 and 1908, and of those 

 conducted by him and under his immediate supervision by field 

 and office assistants of this Bureau, Messrs. W. F. Fiske, H. E. Burke, 

 and J. L. Webb. It relates to the most destructive enemies of the 

 coniferous forests of North America, gives practical methods for 

 their control, and serves as a supplement to Technical Series No. 17, 

 Part I, the two publications together making a very complete tech- 

 nical and popular monograph of the genus Dendroctonus, the major 

 part of which is based on original research. It is believed that these 

 contributions will mark an important era in the history of forest 

 entomology in America, and should be of special value to the sys- 

 tematic and economic entomologist and to students of forest ento- 

 mology. This part should be of exceptional interest and value to 

 practical foresters in the management of National and State forests, 

 as well as to private owners of forests. The illustrations are mainly 

 reproduced from Technical Series No. 17, Part I. 



I recommend the publication of this manuscript as Bulletin No. 



83, Part I, of the Bureau of Entomology. 



Respectfully, 



L. O. Howard, 



Kiitomologist and Chief of Bureau. 

 Hon. James Wilsox, 



Secretary of Agriculture. 



