CONTENTS. 



General considerations 17 



History 17 



Destructiveness 21 



Territory affected 25 



Distribution of the boll weevil 27 



Prospects 28 



Life history 30 



Summary 30 



The egg 31 



Embryonic development 31 



Duration of egg stage 32 



Hatching 33 



Hatching of eggs laid outside 33 



Eating of eggs deposited outside 33 



Percentage of eggs that hatch 34 



The larva 34 



Description 34 



Growth 35 



Molts 35 



Process of molting 35 



Duration of larval stage 36 



Pupal cells in bolls 37 



Pupation 37 



The pupa _ 38 



Duration of pupal stage 38 



The adult 39 



Before emergence 39 



Emergence 39 



Changes after emergence 40 



Description of adult ^ 40 



Size of weevils 41 



Relation of size to food supply 41 



Weight of adults 42 



Color 42 



Size and color not indicative of sex 43 



Secondary sexual characters 43 



Proportions of the sexes 43 



Duration of life upon squares 44 



Duration of life on bolls alone 46 



Duration of life on cotton leaves alone 46 



Duration of life with sweetened water and with molasses 47 



Duration of life wdthout food, but with water 47 



Duration of life without food or water 47 



Cannibalism 48 



(5) 



