LETTER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Division of Entomology, 

 Washington, D. C, May 23, 1904. 

 Sir: I have the honor to transmit herewith manuscript of a cata- 

 logue of the exhibit of insect enemies of forests and forest products 

 of the Louisiana Purchase Exposition held at St. Louis, Mo., during 

 the present year. It has been prepared under my direction by Dr. 

 A. D. Hopkins, in charge of Forest Insect Investigations, in the hope 

 of increasing the economic value of the exhibit, and is practically a 

 continuation of the catalogue of the~ general exhibit which has been 

 published as Bulletin 47 of the present series. The catalogue has 

 been divided into four sections, as fully explained by its author. In 

 the preparation of the exhibit Doctor Hopkins has had the expert 

 assistance of Prof. W. E. Rumsey, of the West Virginia Experiment 

 Station, and, later, of Mr. W. F. Fiske, of this Division, who has 

 also assisted in the preparation of the catalogue. I recommend its 

 publication as Bulletin No. 48 of this Division. 

 Respectful^, 



L. O. Howard, 



Entomologist. 

 Hon. James Wilson, 



Secretary of Agriculture. 



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