CONTENTS 



Page. 



Hibernation and development of the cotton boll weevil . . E. Divight Sanderson . . 1 



Introduction 1 



Hibernation 1 



Date of entering hibernation 1 



Number of weevils entering hibernation 5 



Development of immature stages during normal period of hibernation. 8 



Mortality of hibernating weevils 11 



Time of greatest mortality during hibernation 14 



Places of hibernation 17 



Time of emergence from hibernation 19 



Prevention of hibernation 22 



Summer broods of the weevil 25 



Mortality of summer broods 28 



Rate of increase of the weevil 31 



Injury to squares in relation to the natural increase of squares 33 



Notes on the biology of certain weevils related to the cotton boll weevil 



W. D wight Pierce.. 39 



Introduction 39 



Anthonomus disjunctus Lee 41 



Anthonomus julvus Lee 41 



Anthonomus squamosus Lee 42 



Lixus musculus Say 43 



Orthoris crotchii Lee 44 



An ant enemy of the cotton boll weevil. (Solenopsis geminata Fab. var. xyloni 



McC . ) W.E. Hinds . . 45 



Introduction 45 



Description 45 



An enemy of the cotton leaf-worm and bollworm 46 



Its work as an enemy of the cotton boll weevil 46 



Distribution 48 



A predatory bug reported as an enemy of the cotton boll weevil. (Apiomerus 



spissipes Say) A . C. Morgan . . 49 



Introduction 49 



Life history 49 



Food 50 



Length of life cycle 53 



Natural enemies 54 



Distribution 54 



Conclusion 54 



a The seven papers constituting this bulletin were issued in separate form on Jan- 

 uary 15, February 5, February 5, February 8, February 9, January 22, and February 9, 

 1907, respectively. 



