LETTER OF TRANSMITTAL 



U. S. DEPARTMENT or AGRICULTURE, 



DIVISION OF ENTOMOLOGY, 

 Washington, D. C., January 22, 1902. 



SIR: In the temporary absence of Dr. L. O. Howard, Chief of the 

 Division of Entomology, I have the honor to transmit herewith the 

 manuscript of a paper entitled "Insect Enemies of the Pine in the Black 

 Hills Forest Reserve," by Dr. A. D. Hopkins, Entomologist of the 

 West Virginia Agricultural Experiment Station. The extensive losses 

 occasioned in recent years by insects to forest lands in various portions 

 of the United States, and particularly in the North and Northwestern 

 regions, have attracted great attention, and have necessitated investi- 

 gations as to the character of the injury in order that the most appro- 

 priate methods of control may be advised. The present contribution 

 is the third of a series bearing upon the insect enemies of coniferous 

 trees, and comprises a summarized account of results of a special 

 investigation that was made during the year 1901 under instructions 

 from this Division and with the cooperation of Mr. Gifford Pinchot, 

 Forester of this Department, together with a consideration of valuable 

 suggestions for preventing losses, based upon studies by Dr. Hopkins 

 extending over a number of years. I recommend its early publication 

 as Bulletin No. 32, new series, of this Division. 

 Respectfully, 



F. H. CHITTENDEN. 



Acting .En tojnf>loc/!xf. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 

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