Ho 



UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 231 



"°e 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. , 



PROFESSIONAL PAPER 



August 2, 1915 



RECENT STUDIES OF THE MEXICAN 

 COTTON BOLL WEEVIL 



By 



B. R, COAD, Entomological Assistant, Southern Field 

 Crop Insect Investigations 



CONTENTS 



Page 



Introduction 1 



Distribution . . . . " 2 



Food Plants 3 



Characteristics of the Adults 4 



Longevity of Adult Weevils 6 



Sex of Adults 10 



Reproduction 10 



Page 



Development .....,.;... 27 



Hibernation 31 



Natural Control 31 



Behavior of Louisiana Weevils at Victoria 32 

 Development of Thurberia thespe- 



sioides 33 



Examination of Thurberia bolls .... 33 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1915 



