LETTER OF SUBMITTAL. 
DEPARTMENT OF AGRICULTURE, 
DIVISION OF ENTOMOLOGY, 
Washington, D. C., May 15, 1888. 
Str: I have the honor to submit for publication Bulletin No. 19 of 
this Division, being an enumeration of the published synopses, cata- 
logues, and lists of North American insects; together with other infor- 
mation to assist the student of American Entomology. 
Respectfully, 
Cl Y. RILEY. 
Entomologist. 
Hon. NORMAN J. CoLMAN, 
Commissioner of Agriculture. 
