LETTER OP SUBMITTAL. 



Department of Ageicultuee, 



Division of Entomology, 



Washington, D. C, May 15, 1«88. 

 SiE: 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, 



C. V. ElLBY, 

 Untomologist. 



Hon. NOEMAN J. CoLMAN, 



Commissioner of Agriculture. 



