CONTENTS. 



Page. 



General considerations 11 



Historical 11 



Destructiveness 14 



Territory affected 16 



Prospects .. 18 



Life history . 20 



Summary 20 



The egg 20 



Embryonic development 21 



Length of egg stage 21 



Hatching 22 



Eating of eggs deposited outside 22 



Percentage of eggs that hatch 23 



The larva 23 



Description 23 



Growth 24 



Molts 24 



Process of molting . . , 24 



Length of larval stage 25 



Pupal cells in bolls 26 



Pupation 26 



The pupa 26 



Length of pupal stage ' 27 



Effect of burying squares upon pupation and the escape of adults. _ 28 



The adult 29 



Before emergence 29 



Emergence 29 



Changes after emergence 29 



Size of weevils - 30 



Relation of size to food supply 30 



Weight of adults 30 



Color 31 



Size and color not indicative of sex 31 



Proportions of the sexes 32 



Length of life upon squares 33 



Length of life on bolls alone . 34 



Length of life on cotton leaves alone . . 34 



Length of life with sweetened water and with molasses . 35 



Length of life without food, but with water 35 



Length of life without food or water - 35 



Cannibalism 36 



5 



