LLUSTRATIONS. 



PLATES. 



Page. 



Plate I. Fig. 1. — Adult boll weevil, dorsal view Frontispiece 



Fig. 2. — Adult boll weevil, lateral view Frontispiece 



Fig. 3. — Egg Frontispiece 



Fig. 4. — Full-grown larva Frontispiece 



Fig. 5. — Pupa, ventral view Frontispiece 



Fig. 6. — Adult with wings spread . . . . Frontispiece 



II. Fig. 7. — Collection showing life history and work of boll weevil ... 32 



III. Fig. 8. — Partly stripped square showing two eggs and a feeding 



cavity 32 



Fig. 9. — Square with egg deposited outside 32 



Fig. 10. — Square with full-grown larva 32 



Fig. 11. — Pupa just formed within square 32 



Fig. 12. — Weevil just transformed to adult in square 32 



Fig. 13. — Two large larvse in large boll 32 



IV. Fig. 14. — Pupal cell from boll, broken open 36 



Fig. 15. — Side view of pupa 36 



Fig. 16. — Ventral view of pupa 36 



Fig. 17. — Four pupal cells from bolls compared with four cotton seeds. 36 



V. Fig. 18. — Weevil just escaping from a square 40 



Fig. 19. — Weevil just escaping from boll, normal method 40 



Fig. 20. — Square showing emergence hole of weevil 40 



Fig. 21. — Unopened boll showing emergence hole of weevil 40 



Fig. 22. — Cage used in breeding weevils. 40 



Fig. 23. — Weevils feeding on large boll 40 



VI. Fig. 24. — Leaf fed upon by weevils in confinement 48 



Fig. 25. ^-Square about to bloom destroyed by weevil 48 



Fig. 26. — Weevil full grown in square of usual size 48 



Fig. 27. — Larva full grown in square; would fall with corolla 48 



Fig. 28. — Weevil full grown in square, ovary untouched 48 



VII. Fig. 29. — Weevil larva destroying two locks of boll 48 



Fig. 30. — Weevil preparing puncture for oviposition 48 



Fig. 31. — Square injured by many feeding punctures 48 



Fig. 32. — Bloom distorted by many feeding punctures 48 



Fig. 33. — Comparison of flared with normal square 48 



VIII. Fig. 34. — External signs of weevil injury to large boll 60 



Fig. 35. — Internal effect of weevil feeding on large boll 60 



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