LETTER OF TRANSMITTAL. 
r. S. Department of Agriculture. 
Division of Entomology, 
Washington, 1). C. September 1, 1- -. 
Sir: In the letter of introduction to Bulletin Xo. 15. New Series. I 
mentioned tbe fact that the chinch bug was one of the most dangerous 
of the destructive insects of North America, and that the necessity for 
a complete and timely bulletin for distribution by this Department was 
emphasized by the almost daily demand for information. The same 
condition of affairs exists regarding the Hessian fly, and the accompany- 
ing manuscript, which has been prepared by Herbert O shorn, entomol- 
ogist of the Agricultural Experiment Station at Ames, Iowa, and pro- 
fessor of entomology in the Iowa State Agricultural College, has been 
prepared by your direction and under the writer's supervision, to fill 
the want. 
I recommend its publication as Bulletin Xo. 1<>. New Series. 
Respectfully. 
L. O. Howard, 
Hon. James Wilson, Entomologist. 
Secretary of Agriculture 
