LETTER OF TRANSMITTAL. 
U.S. DEPARTMENT OF AGRICULTURE, 
BurEAU OF ENTOMOLOGY, 
Washington, D. C., July 29, 1907. 
Str: I have the honor to transmit herewith a manuscript entitled 
“Studies of Parasites of the Cotton Boll Weevil,” by Mr. W. Dwight 
Pierce, a special field agent of this Bureau engaged in cotton boll 
weevil investigations. Some of the preliminary results of these 
studies were published as Bulletin No. 63, Part II, of the Bureau of 
Entomology, under the title ‘‘ Notes on the Biology of Certain Weevils 
Related to the Cotton Boll Weevil.”” The boll weevil in the United 
States is now known to be attacked by several species of parasitic 
insects. These have not been introduced with the boll weevil from 
the country from which the latter spread, but they have been here 
for years as parasites of other species of weevils occurring in the 
territory now infested by the boll weevil. The present manuscript 
contains a record of investigations of these parasites and deals 
especially with the possible practical applications which may be 
made of the results gained. I recommend its publication as Bulletin 
No. 73 of this Bureau. 
Respectfully, L. O. Howarp, 
Entomologist and Chief of Bureau. 
Hon. JAMES WILSON, 
Secretary of Agriculture. 
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