LETTER OF SUBMITTAL. 



U. S. Department of Agriculture. 



Division of Entomology, 

 Washington, D. C, March 15, 13S7. 

 Sir ; I have the honor to submit for publication Bulletin Xo. 10 of 

 this DivisioD, being an account of the more important insects which de- 

 foliate our shade trees. While of interest to other sectioDS of the 

 country, it has been prepared primarily to supply the constant demand 

 for information by residents of the National Capital. In the series of 

 Bulletins of this Division it takes the place of one on "Bird Migration 

 in the Mississippi Valley.'' announced a year ago, and which, since the 

 creation of the separate Division of Ornithology and Mammalogy. I 

 have thought best to leave out of the series from the Entomological 

 Division, especially as Dr. Merriam, the Ornithologist, has greatly am- 

 plified it. 



Respectfully, 



C. V. RILEY. 



Entomologist, 



Hon. XORMAN J. COLMAN. 



Commissioner of Agriculture, 



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