i DEPARTMENT OF AGRICULTURE. 
DIVISION OF ENTOMOLOGY.. 
BULLETIN No. 22. 
Roe Ok TS 
OF 
OBSERVATIONS AND EXPERIMENTS 
IN 
THE PRACTICAL WORK OF THE DIVISION, 
MADE 
_ UNDER THE DIRECTION OF THE ENTOMOLOGIST. 
(PUBLISHED BY THE AUTHORITY OF THE SECRETARY OF AGRICULTURE.) 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1890. 
