175 



Control, natural — Continued. Pa,ge. 



Mechanical control 132-134 



Movement of weevils, thermal influence upon. See Thermal influence 



upon locomotive activity. 

 Overflows. See Floods. 



Parasites, bred from infested squares 144-148 



Bracon dorsata, occasionally attacks weevil 146 



Bracon meU'dor, most common parasite of boll weevil 145 



Bruchophagus herrera.', bred from weevils in Mexico 14& 



Catolaccus incertus, probably primary parasite of weevil 145 



Chalcis coloradensis, probablj^ from lepidopterous larvse 145 



Eupelmus spp. , probably some dipterous host 145 



Eurytoma tylodermatk, possibly from weevil larva 146 



Eurijtoma sp. , probably some dipterous host 145 



Goniozus platynoise, probably some lepidopterous host 145 



Ooencyrtus sp. , probably from lepidopterous eggs 146 



PediculGides ventricosus, most common on wasp larvae 146-147 



Sigalphus curculionis, primary parasite of weevil 145 



Urosigalphus robusiiis, probably primar}- parasite of vreevil 146 



Parasites, breeding of 144-146 



Pilosity of plant obstructing weevil movement , 132-133 



Predatory enemies 148-153 



Ants attacking boll weevil 148-150 



Birds in their relation to boll weevil 150-153 



Ectatomma tuberculatum^ enemy of boll weevil 149-150 



Formica fvsca perpilosa, attacking weevil in Mexico 148-149 



Guatemalan ant. See Ectatomma tuberculatum. 

 Kelep. See Ectatomma tuberculatum. 

 Mantids. See Stagmomantis limbata. 



Mantispa sp., devouring weevils 150 



Native ants as enemies of weevil 148-149 



Solenopsis geminata, most important of native ants 149 



Stagmomantis limbata^ devouring weevils 150 



Proliferation, effect in bolls and squares 133 



Kains, effect upon development of weevils 137-138 



Submergence of weevils, effect of 139-140 



Temperature endured by larvae in squares exposed to sun 135-136 



Temperature endured by weevil stages in winter 136-137 



Thermal influence upon activity and development 98-100 



Thermal influence upon locomotive activity 101-102 



Wet winter, effect upon hibernation 138 



Cotton production. See under General considerations. 

 Cotton-seed meal for weevils. See under Life history; Food habits- 

 Damage done by weevil. See General considerations; Destructiveness. 

 Description of adult. See under Life history; Adult. 

 Destruction of stalks. See Control, artificial; Cultural method, and under 



Seasonal history. 

 Diseases of weevils. See under Control, natural. 



Dissemination or spreading of weevils 123-132 



Artificial agencies assisting in 123-127 



Border line, gin agency at. See Gin agency at border line. 

 Cotton-seed shipment. See Shipment of seed cotton and cotton seed. 

 Duration of life, weevils buried among grains. See Weevils buried among 

 grains, duration of life. 



