U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN NO. 77. 



L. O. HOWARD, Entomologist and Chief of Bureau. 



HIBERNATION OF THE MEXICAN 

 COTTON BOLL WEEVIL. 



BY 



W. E. HINDS AND ^Y. W. YOTHERS, 



UNDER THE DIRECTION OF 



W. D. HUNTER. 



Issued October 18, 1909. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1909. 



