Life history— Continued. Page. 
The aduh — Continued. 
Proportions of the sexes 92 
Length of hfe 92 
Day habits 93 
Night habits 94 
Attraction by Hghts 95 
Attraction by poisoned sweets 96 
Length of life cycle 97 
Generations of the bollworm 98 
Laboratory experiments 99 
Seasonal history 102 
Appearance of spring moths 102 
Progress of infestation by generations 103 
Increase in numbers during the season 104 
Do the adults hibernate? 104 
Insects sometimes mistaken for the bollworm 105 
Predaceous enemies 107 
Predaceous enemies of the eggs and young larvse 107 
Predaceous enemies of the larger larv?e and moths 109 
Parasites. 115 
Parasites of the egg 115 
Description of TricJiogramma pretiosa Riley li 8 
Description of Telenomus heliothidis Ashmead 119 
Parasites of the larva 119 
Hymenopterous parasites 121 
Description of Microplitis nigripeanis Ashmead 122 
Dipterous parasites — Tachinidse 123 
Diseases /- 124 
Bacterial disease - '. 124 
Scavengers following the bollworm 126 
Methods of bollworm control 127 
Cultural methods 127 
Trap crops 130 
Arsenical poisons 131 
Ineffective methods of combating the bollworm 132 
Mechanical destruction 133 
Methods of bollworm control on corn, tomatoes, and tobacco 133 
Bibliography 135 
Index 151 
