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 oiitside 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 scjuares upon pupation and the escape of adiilts. . 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, Imt with water 35 



Length of life without food or water 35 



Cannibalism 36 



5 



