LETTER OF TRANSMITTAL. 
SHREVEPORT, LOUISIANA, February 19, 1891. 
Srr: In compliance with your request | have made out a report of 
progress of an investigation of the History and Habits of the Boll Worm 
(Heliothis armigera Hiibner), carried on under your instructions since 
July, 1890, and submit the same herewith. The treatment of the various 
subjects is not at all in detail and has only been made complete enough 
to give an adequate conception of what has been done, the present 
status of the investigation, and what remains to be accomplished in 
the future. 
Very respectfully yours, 
EF. W. MALLY, 
Assistant Entomologist. 
Drs Uy VV. RILEY; 
United States Entomologist. 
1 
