LETTER OF TRANSMITTAL 



U. S. Department of Agriculture, 



Bureau of Entomology, 



Washington, D. C, September £8, 1911. 

 Sir: I have the honor to transmit herewith a manuscript entitled 

 "The Insect Enemies of the Cotton Boll Weevil," by Messrs. W. 

 Dwight Pierce, E. A. Cushman, and C. E. Hood, agents and experts 

 engaged in cotton boll weevil investigations. The present manu- 

 script contains a complete summary of the studies of the boll-weevil 

 parasites conducted since 1905. The boll weevil is now known to 

 be attacked by 29 species of parasites and 26 species of predatory 

 insects, most of which are indigenous to the United States. It is the 

 purpose of this manuscript to show the sources and value of these 

 enemies and to indicate how they may be utilized to the advantage of 

 the farmers of the cotton belt. I recommend the publication of this 

 manuscript as Bulletin No. 100 of the Bureau of Entomology. 

 KespectfuUy, 



L. O. Howard, 

 Entomologist and CJiief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture, 



