LLUSTRATIONS. 



PLATES. 



Plate I. Fig. 1. — Cotton boll weevil Frontispiece 



Fig. 2. — Weevil feigning death Frontispiece 



Fig. 3. — Two eggs and feeding excavation in a square . _ . Frontispiece 



Fig. 4. — Full-grown larva _ . .' Frontispiece 



Fig. 5. — Pupa, ventral view Frontispiece 



Fig. 6. — Pupa, side view Frontispiece 



Fig. 7. — Larva, full-grown Frontispiece 



Fig. 8. — Pupa Frontispiece 



Fig. 9.— Adult Frontispiece 



Fig. 10. — Weevils feeding on boll : _ Frontispiece 



Fig. 11. — Larva developing in boll Frontispiece 



II. Fig. 12. — Collection showing life history and work of boll weevil- _ 24 



III. Fig. 13. — Two weevils feeding on a square 24 



Fig. 14.— Egg isolated 24 



Fig. 15. — Full-grown larva in square 24 



Fig. 16. — Full-grown larva isolated . . _1 24 



Fig. 17.— Pupa :. 24 



Fig. 18.— Adult just transformed 24 



Fig. 19. — Large larvae in large boll 24 



Fig. 20. — Pupal cell in boll broken open 24 



IV. Fig. 21. — Emergence hole made by weevil in square 32 



Fig. 22. — Weevil escaping normally from boll 32 



Fig. 23. — Apparatus used in breeding weevils 32 



Fig. 24. — Larva destroying the ovary and preventing bloom in 32 



large square 32 



Fig. 25. — Leaf fed upon by weevils in confinement 32 



Fig. 26. — Emergence hole of weevil from boll which never opened. 32 



V. Fig. 27. — Larva in square, ovary untouched 32 



Fig. 28. — Large and small larva? in boll 32 



VI. Fig. 29. — Square much fed upon 48 



Fig. 30. — Distorted bloom, caused by feeding upon large square.- 48 



VII. Fig. 31. — Blooms distorted by feeding punctures, open but imper- 48 



feet 48 



Fig. 32. — Small boll riddled by feeding punctures 48 



Fig. 33. — One lock of boll destroyed by feeding punctures 48 



VIII. Fig. 34. — External appearance of large boll much fed upon 56 



Fig. 35. — Internal appearance of same boll ... 56 



IX. Fig. 36. — Cages used to confine weevils in field 56 



Fig. 37. — Plant showing tagged squares from cage work 56 



