LE'ITER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Entomology, 

 Washington, D. C, March 29, 1910. 

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

 bulletin on preventive and remedial work against mosquitoes. 



It is my hope, with your approval, to follow this with four other 

 bulletins and a circular, all relating to mosquitoes, and to prepare 

 the series in such a way as to bring about a measurably complete 

 consideration of these annoying and dangerous insects for North 

 America. 



I respectfully recommend that this manuscript be published as 

 Bulletin Xo. 88 of this Bureau. 

 Respectfully, 



L. O. Howard, 

 Entomologist and Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture. 



