VIII Journal of A gricultural Research voi. xvm 



Page 

 Plate 9. European com borer and its nearest American allies: A. — Profile 

 of cephalic end of pupa of Pyransta ainsliei. B. — Profile of cephalic end 

 of pupa of P. penitalis. C. — Profile of cephalic end of pupa of P. nubilalis. 

 D. — Pupa of P. nubilalis, female; dorsal view. E. — Pupa of P. nubilalis, 

 female; ventral view. F. — Caudal end of pupa of P. nubilalis, female; 

 ventral view. G. — Caudal end of pupa of P. penitalis, female; ventral 



view 178 



Plate 10. European com borer and its nearest American allies: A. — Dorsal 

 view of head capsule; larva of Pyrausta nubilalis. B. — Lateral view of 

 head capsule; larva of P. nubilalis. C. — Epipharynx; larva of P. nubila- 

 lis. D. — Labrum ; larva of P. nubilalis. E. — Dorsal view of head capsule; 

 larva of P. penitalis. F. — Lateral view of head capsule; larva of P. peni- 

 talis. G. — Dorsal view of head capsule ; larva of P. ainsliei 178 



Plate II. European corn borer and its nearset American allies: A. — Labium 

 and maxillae; larva of Pyrausta nubilalis. B. — Left maxilla; larva of P. 

 penitalis. C. — Mandible; larva of P. penitalis. D. — Mandible; larva of 

 P. nubilalis. E. — Character of skin granulations, highly magnified; larva 

 of P. nubilalis. F. — Second thoracic and eighth and ninth abdominal seg- 

 ments of larva of P. nubilalis, showing granulose areas above seta VII. 

 G. — Setal map of prothoracic, mesothoracic, third, eighth, and ninth ab- 

 dominal segments; larva of P. nubilalis. H. — Crochet arrangement; ab- 

 dominal proleg; larva of P. nubilalis 178 



Bacterial Blight op Soybean 



Plate A. Bacterial spot on leaves of soybean 194 



Plate 12. Bacterium glycineum: A. — Soybean petiole. Natural infection, 

 showing exudate droplets. B. — Blighted soybean pod. Natural infec- 

 tion, showing young water-soaked lesions. C. — Blighted soybean pod. 

 Natural infection, showing exudate droplets 194 



Plate 13. Bacterium glycineum.: A. — Natural infection on soybean pods. 



B. — Artificial infection on soybean pods inoculated with type strain 194 



Plate 14. Bacterium glycineum: A. — Six-day-old potato agar slant culture, 



strain E. B and C. — Six-day-old potato agar slant cultures, type strain. . . 194 



Plate 15. Bacterium glycineum-: A. — Colonies of petiole strain on potato 

 agar plate. B. — Colonies of type strain on potato agar plate. C. — Colo- 

 nies of strain E on potato agar plate. D.— Colony of seed strain on potato 

 agar plate 194 



Plate 16. Bacterium glycineum,: Soybean seedlings showing infection after 



inoculation in the greenhouse with type strain 194 



Plate 17. Bacterium glycineum: Blighted soybean leaves artificially inocu- 

 lated in the field with type strain 194 



Plate 18. Bacterium, glycineum: Soybean seedlings artificially inoculated in 



the greenhouse with type strain 194 



Development of the Pistillate Spikelet and Fertilization 

 IN Zea mays L. 



Plate 19. Longitudinal section of the pistillate spikelet of com at the time 

 the silk is ready for pollination: r, rachilla; g, lower empty glume; g^, upper 

 empty glume; 1, lemma or flowering glume of the fertile flower; V, lemma 

 or flowering glume of the sterile flower; pa, palet of the fertile flower; pa', 

 palet of the sterile flower; sf, sterile flower; st, rudimentary stamen of 

 the fertile flower; ova, ovary of the pistil; co, cavity of the ovar>'; sk, silk or 

 style; sc, stylar canal; vbs, one of the fibro- vascular biuidles of the silk.. . . 266 



