LETTER OF TRANSMITTAL. 
U. S. Department of Agriculture, 
Division of Entomology, 
'Washington, D. C, October 15, 1892. 
Sir: I have the honor to submit for publication Bulletin No. 28 of 
this Division. It comprises an account of the destructive locusts of the 
United States, and of those species which are liable to become destruc- 
tive, and may be looked upon as supplementary to Bulletins 25 and 27 
of this Division. It has been prepared by Mr. Lawrence Bruner, the 
agent of the Division at Lincoln, Nebr., who has been associated with 
me in the study of the family to which these insects belong, and since 
the completion of the work of the Entomological Commission has made 
a special study of the true locusts of North America, materially aiding 
in the investigations of the injuries caused by them of late years. 
Respectfully yours, 
C. V. Riley. 
Entomologist 
Hon. J. M. Rusk, 
Secretary of Agriculture. 
