U. S. DEPARTMENT OF AGRICULTURE, 



division of entomology. 



Bulletin No. 23. 



REPORTS 



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, 

 189 I. 



