ILLUSTRATIONS, 



PLATES. 



Page. 

 Plate I. Cotton plant attacked by boll weevil, a, Hanging dry square 

 infested by weevil larva; b, flared square with weevil punctures; 

 c, cotton boll, sectioned, showing attacking weevil and weevil 



larva in its cell Frontispiece. 



II. The boll weevil and insects often mistaken for it. a, The cotton 

 boll weevil, Anthonomus grandis; b, the mallow weevil, Anthono- 

 ruusfulvus; c, the southern pine weevil, Pissodes nemorensis; d, the 

 cottonwood flower weevil, Dorytomus mucidus; e, Conotrachelus 

 erinaceus; /, the pecan gall weevil, Conotrachelus elegans 28 



III. Anatomical structure of the boll weevil, a, Dorsal view of anal 



segments of larva; b, front view of head and anterior segments 

 of larva; c, ventral view of anal segments of larva; d, lateral view 

 of adult; e, lateral view of larva;/, ventral view of adult; g, dorsal 

 view of adult with wings spread; h, ventral view of pupa; i, ventral 

 view of anal segments of pupa; j, ventral view of anterior portion 

 of pupa 32 



IV. The adult boll weevil and emergence holes, a, Squares of Peruvian 



cotton showing emergence holes of the Peruvian cotton square 

 weevil; b, square of upland cotton showing emergence hole of the 

 cotton boll weevil; c, adult boll weevil on cotton square; d, adult 

 boll weevil puncturing cotton square; e, adult boll weevil emerg- 

 ing from cotton boll;/, small dry bolls showing emergence holes; g, 



hull of boll with weevils found hibernating 36 



V. Effects of boll weevil attack on leaf and squares, a, Cotton leaf much 

 fed upon by adults; b, square with two egg punctures; c, flared 

 square with many feeding punctures; d, square prevented from 

 blooming by puncture; e, bloom injured by feeding punctures;/, 

 poor blooms caused by feeding punctures 40 



VI. Injury by boll weevil to squares, a, Bloom checked by attacks of 

 larva; b, square opened, showing grown larva; c, square opened, 

 showing pupa; d. dwarfed boll opened, showing one larva and two 

 pupae; e, weevil escaping from square;/, emergence hole of adult 



in square 44 



VII. Injury by boll weevil to bolls, a, Three larvae in boll; b, emergence 

 hole in dry, unopened boll; c, two larvae in boll; d, weevils punctur- 

 ing boll; e, opened boll with two locks injured by weevil;/, large 



bolls severely punctured 44 



VIII. Field conditions in territory occupied by the boll weevil. Fig. a. — 

 Newly planted cotton field, with sprouts from overwintered cotton 

 roots. Fig. b. — Fallen infested squares 76 



IX. Relation of boll weevil cells to seed, a, Boll weevil pupa found in 

 cotton seed; b, boll weevil pupa in cell of lint from boll; c, weevil 

 cell in dwarfed cotton boll containing live pupa taken among seed; 



d, weevil cells in bolls; e, cotton seeds 92 



X. Fig. a. — Boll weevil remains after passing through fan from gin. 



Fig. b. — Ten-sectioned hibernation cage 96 



XI. Hibernation conditions for the boll weevil. Fig. a. — Cotton field 

 adjacent to timber covered with Spanish moss. Fig. b. — Proxim- 

 ity of moss-laden trees, conducing to high infestation by weevil. . 96 

 XII. Hibernation conditions for the boll weevil. Fig. a. — Standing dead 

 timber and forest environment favorable for hibernation of weevils. 



Fig. b. — Litter in forest , suitable for hibernation of weevils 100 



XIII. Hibernation conditions for the boll weevil. Fig. a.— Spanish moss 

 on trees, very favorable for hibernation of weevils. Fig. b. — 

 Density of Spanish moss as a protection to weevils in hibernation. . 100 

 12 



