LETTER OF SUBMITTAL. 
Department of Agriculture, 
Division of Entomology, 
. Washington, D. (7., December 26, 1887. 
Sir : In accordance with the act of Congress approved March 3, 
1881, which provided that the reports of the United States Entomolog- 
ical Commission be made to the Commissioner of Agriculture, I have 
the honor to submit for publication this the fifth and final report of 
said Commission. This report is on the insects affecting forest trees, 
by Dr. A. S. Packard, and has been in part written and completed 
since the termination of the work of the Commission, and while he has 
been connected with the Division as a special agent. 
Respectfully, 
C. V. Riley, 
Chief U. 8. & C. 
Hon. Norman J. Colman, 
Commissioner of Agriculture. 
VII 
