178 THE MEXICAN COTTON-BOLL WEEVIL. 



Page. 



Bark, hibernation shelter for boll weevil 101 



Bartramia longicauda, enemy of boll -weevil 146 



Bermuda grass, duration of life of boll weevils fed thereon 48 



Bindweed. (See Convolvulus repens.) 



Birds inimical to boll weevil 145-146 



Blackberry, host plant of Anthonomus signatus 30 



Blackbird, Brewer. (See Euphagus cyanocephalus. ) 

 red-winged. (See Agelaius pJmniceus.) 

 rusty. (See Euphagus carolinus.) 



Bloodweed, duration of life of boll weevils fed thereon 48 



Blue jay. (See Cyanocitla cristata.) 



Boll weevil, abundance, seasonal 74-85 



variations from year to year 83-85 



activity, zone of temperatures causing il 127 



adult, ability to locate cotton 41 



activity after emergence from hibernation 116-118 



attraction to various cottons 45-47 



substances 42-43 



changes after emergence 38 



color 36 



description 35 



of teneral stage 34-35 



destructive power by feeding 42 



duration of life according to sex 50 



average 47-50 



with normal food 49 



without normal food 48-49 



effects upon squares and bolls of feeding 44^5 



emergence 38 



feeding activity 41-A2 



habits of hibernated weevils 41-42 



female, characters 37 



food habits 38-50 



habits, food 38-50 



protective 38 



longevity, maximum 115-116 



of those emerging from hibernation 111-116 



male, characters 37 



movements on food plant 43^44 



number on stalks at different dates 99 



under rubbish 99 



protective habits 38 



secondary sexual characters 37 



sense of color 43 



size 35-36 



weight 36 



aestivation, zone of temperatures causing it 127 



annual movement in square miles 27-28 



bibliography 169-175 



bird enemies 145-146 



breeding habit, the one probably original 62 



broods 74-76 



cannibalism 50 



causes for natural dissemination 87 



checked by altitude 28-29 



dryness 28 



low temperature 28 



climatic control, effect of cold 19 



drought 16 



early frost 20 



influences on vitality and activities 121-122 



compensations for losses caused thereby 26-27 



control by climatic conditions 1 20-132 



parasites 120 



predators 120 



proliferation 132-135 



