CONTENTS 



Page. 



Entrance into hibernation 11 



Supply of weevils to enter hibernation 11 



Stages entering hibernation 13 



Time of entering hibernation 15 



Proportion of each sex among weevils in fall 16 



Number of adult weevils entering hibernation 17 



Temperature conditions producing hibernation 20 



Shelter during hibernation 25 



Shelter in bolls 25 



Hibernation shelter other than bolls within the field 30 



Hibernation shelter outside of cotton fields 31 



Hibernation experiments in small cages 33 



Cage experiments of 1902-3 ' 34 



Cage experiments of 1903-4 34 



Cage experiments of 1904-5 34 



Hibernation experiments in small cages, 1905-6 35 



Large-cage experiments, Keatchie, La., 1905-6 38 



Favorable conditions for hibernation 41 



Effect of acclimatization upon survival and emergence 42 



Relation of emergence to effective temperatures 43 



Relation of time of entrance into hibernation to survival and emergence. . 45 



The relationship of accumulated effective temperature to emergence 46 



Longevity of weevils after emergence in Keatchie experiments 48 



Large-cage experiments Dallas, Tex., 1905-6 49 



Nature of weevil activity following emergence from hibernation 50 



Climatic conditions producing emergence from hibernation at Dallas, Tex., 



in 1906 ,. ! 52 



Emergence in the field at Victoria, Tex., in 1906 52 



Large-cage experiments, 1906-7, Dallas, Calvert, and Victoria, Tex 55 



Plan of experiments 55 



Climatic conditions producing hibernation and activity of weevils during 



normal hibernation period 57 



Entrance into hibernation 58 



Activity during normal period of hibernation 62 



Winter activity ; 64 



Activity as shown by development dining normal hibernation period .... 66 



Activity in the field during normal hibernation period 67 



Emergence from hibernation, 1907 67 



Relationship of emergence from hibernation to climatic conditions 68 



Effect of time of entering hibernation and nature of shelter upon the jjer- 



centage of survival 74 



Survival of weevils by localities and cage sections 77 



Monthly summary of emergence records 79 



Weekly emergence records 79 



3 



