LEHER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Entomology, 

 Washington, D. C, Augmt 6, 1910. 



Sir: I have the honor to transmit herewith, for pubhcation as Bul- 

 letin No. 58, five papers deahng with insects injurious to forests and 

 forest products. These papers -were issued separately during the 

 years 1906 to 1909. 



Part I, "The Locust Borer," by A. D. Hopkins, comprises a sum- 

 mai-y of information from published accounts, supplemented by data 

 secured by recent investigations, and deals more particularly with 

 practical methods for controlling this, our most important enemy of 

 the black locust. It is designed to be of service to owners of planta- 

 tions and forests, as well as to investigators, in the prevention of 

 injuries to this useful tree. 



Part II, "The Western Pine-destroying Barkbeetle," by J. L. 

 Webb, has special reference to the results of investigations by ^Ir. 

 Webb in central Idaho in 1905, but relates also to the results of other 

 investigations and to available information on the insect and methods 

 of controlling it. 



Part III, "Additional Data on the Locust Borer," by A. D. Hop- 

 kins, comprises a partial revision of Part I and gives additional infor- 

 mation based on the results of investigations carried on since that 

 part was issued. 



Part IV, "The Southern Pine Sawyer," by J. L. Webb, gives the 

 results of special investigations by Mr. Webb and relates to a sub- 

 ject of much economic importance to the timber interests of the 

 Southern States, and especially of sections in which the pine timber 

 is damaged by storms. The results of these investigations and the 

 information contained in this paper make it possible to avoid a large 

 percentage of the losses from damage by the sawyer, which have here- 

 tofore seemed inevitable. 



Part V, "Insect Depredations in North American Forests and Prac- 

 tical Methods of Prevention and Control," by A. D. Hopkins, gives a 

 summary of facts,- conclusions, and estimates relating to the forest- 

 insect problem as applied to North American conditions and calls 

 attention to its importance in the future management of private, 



