LETTER OF SUBMITTAL. 
U. S. DEPARTMENT OF AGRICULTURE, 
DIVISION OF ENTOMOLOGY, 
Washington, D. O., March 15, 1887. 
Sir; L have the honor to submit for publication Bulletin No. 10 of 
this Division, being an account of the more important insects which de- 
foliate our shade trees. While of interest to other sections 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, RILEY 
Cav. Bt : 
Entomologist. 
Hon. NoRMAN J. COLMAN, 
Commissioner of Agriculture. 
