LETTER OF TRANSMITTAL. 
U. S. DeparTMENT OF AGRICULTURE, 
Division OF ENTOMOLOGY, 
Washington, D. C., January 22, 1902. 
Srr: 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. CHIrrenDEN, 
Acting Entomologist. 
Hon. JaAmMEs WILson, 
Secretary of Agriculture. 
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