60 PARASITES OF THE COTTON BOLL WEEVIL. 



Pace. 



Omphale livida, parasite of Ceutorhynchus rapse 43 



Onagra biennis, food plant of Tyloderma foveolatnm 34. 36, 47 



Orthoris crotchii. biological notes 47 



breeding period 49 



host of Eurytoma tylodermatis 34-42 



Microbracon nuperus 44 



Tetrastichus sp 43 



in Mentzelia nuda 34 



Parasites, factor in control of boll weevil 3-5 



known to attack Rhynchophora 41-44 



of boll weevil, artificial propagation 4. 22 



bibliography 51-52 



biological notes 32-41 



biologies of weevils contributing them 44-48 



breeding records of 1906 13-22 



breeding work ll r 27^il 



conclusions 50 



from work of 1906 21-22 



elimination of natural hosts [other weevils] 4-5 



examination work 11-22 



field work 24-27 



geographical and seasonal distribution 31-32 



hibernation in bolls 12 



history 10-11 



intensive centers 9 



occurrence of species 28-31 



percentage in bolls versus squares in 1905 13 



propagation work 11. 22-27 



prospects 50 



records prior to 1906 12-13 



release experiments 24-27 



rotation of hosts 48^19 



schemes for increasing their work 48 



source work 11. 41-50 



transfer or artificial propagation, apparatus and diffi- 

 culties 22-24 



work of 1906. conclusions 11. 50 



Parasitism and status of boll weevil 19-20 



of boll weevil and chronology 21 



by months, 1906 14 



field conditions 17-18 



geographical considerations 18-19 



in fallen bolls , 14. 15. 16. 21 



forms 22 



in shade versus sun 17, 18, 22 



squares 14. 15, 16, 21 



forms in prairie versus woodland 17. 18. 22 



hanging bolls 14. 15. 16, 21 



forms 22 



squares 14, 15, 16, 21 



percentage by years, prior to 1906 11 



plant conditions most favorable 15-17 



Peach curculio. (See Conotrachehis nenuphar.) 



