U. S^. Department of Agriculture, 



Bureau of Entomology, 

 Washington^ D. 61, March i, 1905, 

 Sir: I have the honor to transmit herewith the manuscript, pre- 

 pared under my direction by Messrs. W. D. Hunter and W. E. Hinds, 

 special field agents of this Bureau, of an extended bulletin on the 

 Mexican cotton boll weevil, which is a revision and amplification of 

 Bulletin No. 45 and includes the results of the many important studies 

 made during the season of 1904. It is so amplified and altered as to 

 deserve independent publication. I therefore recommend that it be 

 issued as Bulletin No. 51 of this Bureau. 

 Respectfully, 



L. O. Howard, 

 Entomologist and Chief of Bureau, 

 Hon. James Wilson, 



Secretary of Agriculture, 



