152 



Page. 



Conotelus obscurus 127 



Copulation of moths 92 



Corn, ear Avorm= boll worm 13 



ears, damage to, by single larva 75 



injury to, by bollworm 21 



maturing, damage to, by single larva. 75 



number of plants infested 78 



oviposition on, by bollworm 42 



preferred food of bollworm 21 



sweet, percentage injured by boll- 

 worm 22 



young, damage to, by single larva 74 



Corvus brachyrhyncos 114 



Cotton and cowpeas, comparative acreage 



in, by States 31 



choice of different parts by larva. . . 71 



damage to, by single larva 76 



injury to, by bollworm in different 



States 23 



by bollworm in United 



States 24 



by other causes than 



bollworm 35 



in relation to farm prac- 

 tice 29 



large acreage in relation to boll- 

 worm injury 30 



oviposition on, by bollworm 45 



percentage injured yearly in U. S. 



by bollworm 25 



percentage injured by bollworm in 



Texas 1 '/3 



season of greatest injury to, by boll- 



- worm 32 



Cow bird 1 114 



Cowpea 18 



Cowpeas, eggs laid on 47 



Crab grass 18 



eggs laid on 47 



Cremastogaster lineolata 108 



Crested flycatcher 114 



Crow 114 



blackbird 115 



Cucumber 17 



Cucurbita pepo 17 



Cucumis melo 17 



sativa 17 



Cultivation, early and thorough 128 



Cultural methods 128 



Cyanociita cristatq — , 114 



Cyanosptia ciris 115 



cyanea 115 



Dahlia 17 



Dakota, scarcity of bollworm in 27 



Damage done by single larva 74 



Datura stramonium . 18 



eggs laid on 47 



Delaware, destructiveness of bollworm in . . 28 



Delphax maidis 94 



Dendryphantes nubilis Ill 



Department of Agriculture, early investiga- 

 tion of bollworm by 37 



Deromyia ang%istLpennis 110 



umbrimis Ill 



Description of larval stages 57 



Page 

 Destructiveness in relation to life zones in 



U.S 25 



Diseases 124 



Distribution in relation to life zones in U. S. 25 



Dizonias bicindus ill 



Dorymyrmex pyramicus 108 



Drosophila ampelopMla 127 



, punctulata 127 



Duration of larval instars 63 



Early fruiting cotton 129 



Eating of shells and eggs by ncAvly hatched 



larvEe 51 



Ecdyses, number of 67 



Ecdysis, process of 67 



Economic status in United States 21 



Effective temperatures, relation to growth 



of larvse , 64 



relation to length 



of egg stage 52 



reflation to length 



of life cycle 102 



Effective temperatures, relation to length 



of pupal stage 86 



Effective temperatures, relation to number 



of generations 102 



Egg, description of 41 



development of 50 



Egg laying, effect of fertilization on 49 



plant 18 



stage, length of 52 



Eggs destroyed by storms 55 



distribution of, on cotton plants 46 



effect of atmospheric conditions on. . . 54 



submergence on 54 



sun on 55 



hatching of 50 



in ovaries at death 49 



infertile, deposition of 49 



shrinking of 51 



number laid by a single moth 48 



parasites of 115 



percentage that hatch 52 



Egyptian cotton, relative attractiveness of, 



to larvse 71 



Embryology 50 



Emergence of moths, time of 89 



Erax bastardii Ill 



lateralis Ill 



Erigeron canadense '. 17 



Erythrina herbacea 18 



Eumenes bollii Ill 



Eupatorium serotinum 94 



Euphorbia corollata 47 



EupJiorocera claripennis 123 . 



Euplectrus comsiockii 122 



Europe, bollworm in 19 



Euxesta annonsp 127 



Exorista ceratomiie 123 



Falso sparverius 114 



Fall plowing 128 



Farm methods in relation to bollworm 



injury 29 



Fertilization, effect of, on rate of egg lay- 

 ing ; 49 



Fertilizers 129 



