LETTER OF SUBMITTAL. 
U.S. DEPARTMENT OF AGRICULTURE, 
DIVISION OF ENTOMOLOGY, 
: : Washington, D. C., March 20, 1888. 
rR: The sixth edition of Bulletin No. 9 of this Division, on the Silk- 
rm, having been exhausted, I have the honor to present for publica- 
n a seventh edition, which is little more than a reprint of the sixth, 
1 such slight changes as late experience has suggested. 
Respectfully, 
C. V. RILEY, 
. Entomologist. 
Jon. NorMAN J. COLMAN, 
Commissioner of Agriculture. 
Pr we 
VII 
