9 



Page.^ 



Plate XIY. Fig. 1. — Exit holes of moths from pupal cells in ground 88 



Fig. 2. — Condition of moth immediately after emergence 88 



Fig. 3. — BoUworm moth with wi;igs expanded 88 



Fig. 4. — Bollworm moth on the alert 88 



Fig. 5. — Moth at rest on cotton leaf 88 



XV. Variation in markings of bollworm moths 88 



XVI, Fig, 1, — Cotton square attacked by caterpillar of Calycopis 



cecrops 104 



Figs, 2 and 3. — Larva of Prodenia ornithogaUi on cotton square 



and boll 104 



Fig, 4, — Moths of Prodenia ornithogaUi 104 



XVII. Fig. 1. — Breeding cage used in determining generations of boll- 

 worm; planted to corn 104 



Fig. 2. — Same, planted to cotton later in the season 104 



XVIIT, Fig. 1. — PoUstes annularis and nest 104 



Fig. 2. — Lijcosa riparia, with captured bollworm moth 104 



Fig, 3. — A robber fly, Deromyia angustipennis 104 



Fig. 4. — Mallophora orcina 104 



Fig, 5, — Metapodius femoratus, male and female 104 



XIX, Fig. 1, — Microplitis nigripennis, adults, cocoons, and parasitized 



bollworm 124 



Fig. 2. — Archytas piliventris, parasitic on bollworm 124 



Fig. 3. — Bollworm killed by bacterial disease 124 



Fig. 4. — Bollworm killed by fungus 124 



XX, Fig. 1, — Bollworm experimental farm at Willspoint, Tex 124 



Fig. 2, — Fertilized and unfertilized cotton plats at Willspoint, 



Tex 124 



XXI. Comparative maturity of King and Myers cottons grown under 



identical conditions 128 



XXII. Fig. 1. — Proper use of corn as a trap crop 128 



Fig. 2. — Improper use of corn as a trap crop 128 



XXIII. Fig, 1. — Method of poisoning cotton for leafworm and bollworm . 128 

 Fig, 2. — View of spraying w^ork in poison experiments 128 



XXIV. Fig. 1. — Geared poison ' ' blower ' ' for poisoning cotton 128 



Fig. 2, — Machine used in jarring and collecting bollworms from 



cotton 128 



XXV. Fig, 1.— Cyanide light trap 128 



Fig. 2. — Pans with poisoned sweets 128 



TEXT FIGURES, 



Fig. 1. Map of area infested by bollworm 24 



2. Egg of bollworm; side and top views 41 



3. Diagram showing ''regular" and "irregular" oviposition curves 49 



4. Diagram showing relative length of egg stage 53 



5. Head of bollworm larva 56 



6. Diagrammatic representation of comparative rate of growth of larvae 



during different instars '. . 65 



7. Diagram illustrating relative width and variation in width of the 



head casts of larvae in third and fourth instars 66 



8. Diagram of different types of pupal cells 81 



9. Enlarged caudal end of pupa 84 



10, Chart showing relative length of pupal stage. '. 85 



11, Genitalia of male bollworm moth 92 



12, ' ' Sharpshooter, ' ' Homalodisca triquetra 106 



