Jan. 7-Mar. 25. i9i8 I llustvationS VII 



Plate 18. Longitudinal section of an okra plant naturally infected with Page 

 V erticillium albo-atrum, showing the typical appearance 546 



Plate 19. Verticillium albo-atrum: Two-weeks-old colony on potato agar, 



showing the concentric rings of black sclerotial bodies 546 



Plate 20. Solanuvi melongena, showing effect of wilt: A. — Qjntrol plant of 

 the same age as the wilted plant (B). B. — Wilted plant photographed two 

 months after inoculation at the hypocotyl with Verticillium albo-atrum 

 isolated from wilted eggplant 546 



Plate 21. Abelmoschus esculentus , showing effect of wilt: A. — Control plant. 

 B. — Wilted plant photographed two weeks after inoculation at the hypo- 

 cotyl with a pure culture of Verticillium albo-atrum 546 



Plate 22. Abelmoschus esculentus, showing effect of wilt: A. — Wilted plant 

 inoculated with Verticillium, albo-atrwrn. B. — Control plant of the same 

 age as wilted plant. Both plants were photographed two months after 

 the wilted plant had been inoculated 546 



Plate 23. Abelmoschus esculentus, showing the effect of wilt as a result of 



inoculation with Fusarium vasinfectum isolated from okra- wilt 546 



Plate 24. Gossypium herbaceum (Columbia variety): Control plants 35 days 



old 546 



Plate 25. Gossypium herbaceum (Columbia variety), showing effect of wilt: 

 Wilting plants photographed 15 days after inoculation at the hypocotyl 

 with Fusarium vasinfectum, isolated from wilting cotton plants 546 



Plate 26. Gossypium herbaceum (Columbia variety), showing eft'ect of wilt: 

 Wilting plants photographed 15 days after inoculation at the hypocotyl 

 with Fusarium vasinfectum, isolated from wilting okra 546 



Plate 27. Abelmoschus esculentus, showing the characteristic symptoms of 



the wilt produced by V erticilliurn albo-atrum 546 



Weevils Which Affect Irish Potato, Sweet Potato, and Yam 



Plate 28. Trypopremnon sanfordi: Adult from Cuzco, Peru. A. — Dorsal 

 view. B. — Face of same. C. — Side view of thorax and head. D. — Ven- 

 tral view of adult 612 



Plate 29. Trypopremnon latithorax: Larva from La Paz, Bolivia. A. — Pro- 

 thoracic spiracle. B. — ^Larva, lateral view. C. — Lateral view of head. 

 D. — Right side view of apex of labium. E. — Corresponding hair on left 

 side. F. — Maxillary palpiger and palpus, lateral view. G. — Face 612 



Plate 30. Trypopremnon latithorax: Pupa from La Paz, Bolivia. A. — Dorsal 

 vitfw. B. — Ventral vievv^. C. — Enlarged sketch of eighth, ninth, and 

 tenth abdominal segments 612 



Plate 31. Species of the genus Cylas: A.—Cylasforviicarius elegantulus from 

 Honolulu, Hawaii, side view of head and thorax. B. — Cylas iurcipennis 

 from Sumatra, side view of head and thorax. C. — Cylas brunncus from 

 East Africa, dorsal view of thorax. D. — Cylas brunneus, side view of head 

 and thorax. E. — Cylas brunneus ventral view of thorax. F. — Cylas 

 femoralis, side view of head and thorax 612 



Plate 32. Sweet-potato and yam weevils: A. — Cylas formicarius elegantulus, 

 female, from, sweet potatoes. New Orleans, La. B. — Same, head of male. 

 C. — Euscepes batatae, from sweet potatoes, Hawaii. D. — Same, side view 

 of head. E.^ — Palaeopus dioscoreae, from yams {Dioscorea batatas), Jamaica. 

 F. Same, side view of head 612 



Plate 33. Pups of sweet-potato weevils: A. — Euscepes batatae, Barbados, 

 venter. B. — Same, latero-vcntral view of fifth to tenth segments. C. — 

 Same, dorsal view. D. — Same, venter of seventh to tenth segments. E. — 

 Cylas formicarius elegantulus, Victoria, Texas, ventral view of sixth to 

 tenth segments. F. — Same, ventral view. G. — Same, latero- ventral 

 view. H. — Same, dorsal view 612 



