ILLUSTRATIONS. 



PLATES. 



Page. 

 Plate I. Stages of Mexican cotton boll weevil. Fig. 1. — Adult weevil, dorsal 

 view. Fig. 2. — Adult weevil, side view. Fig. 3. — Full-grown 

 larva, side view. Fig. 4. — Egg. Fig. 5. — Pupa, ventral view. 



Fig. 6. — Adult with wings spread Frontispiece. 



II. Stages and characteristics of Solenopsis geminata. Fig. 1. — Adult, 

 small worker form. Fig. 2. — Sting of worker. Fig. 3. — Right 

 antenna of worker. Fig. 4. — Adult workers, various sizes from 

 workers minor to workers major. Fig. 5. — Larvae and pupae of 

 small forms of worker. Fig. 6. — Larvae of workers major compared 

 with larva and pupa of small forms. Fig. 7. — Workers dragging 

 off adult boll weevil which they have killed 24 



III. Signs determining boll weevil emergence or entrance of ant Solenopsis 



geminata. Fig. 1. — Emergence hole of boll weevil in cotton square. 

 Fig. 2. — Entrance holes of ants in squares. Fig. 3.— Evidences 

 of adult activity in square from which weevil emerged. Fig. 4. — 

 Clean interior of square entered by ants. Fig. 5. — The three evi- 

 dences of adult weevil activity, removed from square: a, Shed 

 pupal skin; b, refuse formed in cutting emergence hole; c, ex- 

 crement of unfed, young adult 20 



IV. Shedding and retention of forms in cotton. Fig. 1. — a, b, c, Normal 



scars left by shed forms. Fig. 2. — a, 6, c, Abnormal scars with 

 forms retained. Fig. 3.— a, Longitudinal section through normal 

 scar; 6, longitudinal section through base of retained form 20 



TEXT FIGURES. 



Fig. 1. Map of Louisiana, showing dispersion movements of 1903 and 1904 



and reduction of infested area by winter conditions of 1904-1905. 10 



2. Solenopsis geminata 24 



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