180 



Life history — Continued. • Page. 



Reproduction — Continued. 

 Development — Continued. 



Life cycle, period of.. 93-95 



Percentage of weevils from infested squares 92 



Thermal influence upon development 98 



Fertility, duration of 76 



Fertilization 75-76 



Generations. See Development; Broods or generations. 



Method of making field observations 74-75 



Progeny from one pair weevils, annual possibility 97-98 



Sex 43-44 



Not indicated by size or color 43 



Influence of retarded development upon 100 



Proportions of each 43-44 



Sexual characters, secondary 43 



Size of weevils 41 



Summary, life history " 30-31 



Time weevils exist on foliage before formation of squares 53-54 



Weight of weevils .* 42 



Machines. See under Control, artificial ; Machines. 



Molasse§ for weevils. See under Life history; Food habits. 



Multiplication of weevils. A^e under Life history; Reproduction; Progeny of 



one pair. 

 Oviposition. See under Life history. 

 Parasites. See under Control, natural. 



Plants attacked by some inse«ts mistaken for boll weevil 66, 67 



Amaranthus grxcizans, attacked by ironweed weevil 66, 67 



Amaranthus hybridus, will not sustain boll weevil 65 



Amaranthus spinosus, will not sustain boll weevil 65 



Ambrosia psilostachija, attacked by blood weed weevil 67 



Argemone alba, attacked by ironweed weevil 66, 67 



Bloodweed. See Ambrosia psilostachya. 

 Broad-leaved gum plant. See Grindelia sguarrosa. 



Convolvulus repens, will not sustain boll weevil 65 



Grindelia sguarrosa, probably attacked by Desmoris scapalis 66, 67 



Helianthus annuus, attacked by sunflower weevil 65, 67 



Hibiscus esculentus, will not sustain boll weevil 64-65 



Hibiscus manihot, will not sustain boll weevil 64-65 



Hibiscus moscheutos, will not sustain boll weevil 64-65 



Hibiscus vesicarius, will not sustain boll weevil 64-65 



Kidney cotton, probably original food plant of boll weevil 65 



Prickly poppy. See Argemone alba. 



Frinopsis ciliata, probably attacked by Desmoris scapalis 66 



Ragweed. See Ambrosia p)silostachya. 



Sorghum sap nourishing to boll weevils - 65 



Sunflower. See Helianthus annuus. 

 Tumble-weed. See Amaranthus grsecizans. 

 White prickly poppy. See Argemone alba. 

 Proliferation of tissue. See under Control, natural. 

 Rains, effect upon weevil. See under Control, natural. 



Reasons for large crop of 1904 ^ 23-25 



Remedies. See Control, artificial. 

 Reproduction. See under Life history. 



