ILLUSTRATIONS. 



PLATES. 



Page. 

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

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



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- 

 musfulvus; c, the southern pine weevil, Pissodes^nemorensu; 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 



.Mients 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 Permian 



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

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

 pupse; 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; 6, 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 !>6 



XT. 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.. 06 

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

 timber and foresl 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 uves. very favorable for hibernation of weevils. Fig. b. — 

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

 L2 



