U.S. DEPARTMENT OF AGRICULTURE. 
£ DIVISION OF ENTOMOLOGY. 
BULLETIN No. 23. 
RC Eeei@rker S 
OF 
OBSERVATIONS AND EXPERIMENTS 
THE PRACTICAL WORK OF THE DIVISION, 
UNDER THE DIRECTION OF THE ENTOMOLOGIST. 
(PUBLISHED BY THE AUTHORITY OF THE SECRETARY OF AGRICULTURE.) 
( 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
ar Sg rs 
