Jan. 6-Mar. 31, 1919 



Illustrations vii 



Page 



Plate ii. Old sheaths and culms of corn showing effects of severe attacks by 

 Physoderma zeae-maydis: A, B. — Badly diseased stalks broken over at 

 weakened, infected lower nodes. C, E. — Portions of old attacked sheaths 

 showing characteristic shredding. D. — Portion of an old infected stalk 

 showing discoloration both on outside and in pith due to the attacks of 

 the fungus 154 



Plate 12. Blades and sheath of com showing the Physoderma disease pro- 

 duced by inoculating plants in the greenhouse with a suspension of the 

 sporangia of P. zeae-maydis in tap water 154 



Plate 13. Physoderma zeae-maydis: Various stages in the germination of 

 sporangia, formation of zoospore, and germination of zoospore, a. — Spor- 

 angium, b, c, d. — Opening sporangia showing the earl)^ stages of zoospore 

 formation, e. — Mature zoospores escaping through the ruptured apex of 

 the endosporangium . /. — The collapsing endosporongium after the zoo- 

 spores have escaped, g. — Zoospores, h. — Germinating zoospores 154 



Plate 14. Physoderma zeae-m.aydis: a-f. — Zoospores germinating by fine 

 threadlike hyphae which have penetrated the epidermal cell walls of a 

 tender leaf of Indian com. In c, e, and/ the enlarged cells have begun to 

 form in the epidermal cells of the host 154 



Plate 15. Physoderma zeae-m,aydis : Mycelial stages within the host cells. 

 a-d. — Drawings from ordinary' high-power magnifications showing the 

 fibers and enlarged cells of the mycelium, e-g. — Drawings magnified with 

 oil-immersion lens, b, d, g. — Notice the young sporongia at the ends of 

 the short hyphae 154 



Plate 16. Physoderm,a zeae-maydis: a-e, Mycelial fibers penetrating the cell 



walls of the host tissue. /, g, Different t^'pes of reproductive bodies 154 



Plate 17. Physoderma zeae-maydis: Photomicrographs showing the different 

 stages of the development in the host tissue (teosinte). A. — Notice the 

 reproductive bodies connected by the very fine threadlike hyhae in the 

 central cells of the figure. B. — Host cells filled with mature sporangia. . . 154 



Injury to Casuarina Trees in Southern Florida by the Mangrove Borer 



Plate 18. A. — Casuarina trees planted along the water front, Belle Isle, 

 Miami Beach, Fla., June, 1918. B. — Casuarina trees disfigured and killed 

 by the mangrove borer {Chrysobathris tranquebarica) at Miami Beach, Fla. . 164 



Plate 19. Chrysobothris tranquebarica: A. — Sex differences in the last 

 abdominal segment. B. — Lateral and dorsal view of ovipositor. C. — 

 Bark of red mangrove (Rhizophora mangle) showing how it is divided into 

 plates 164 



Plate 20. Chrysobothris tranquebarica: A. — Larval burrow in cambium of 

 Australian pine (Casurina equiseii/olia), Miami Beach, Fla. B. — Larvae, 

 ventral and dorsal views. C. — Pupa, dorsal and central views. D. — 

 Female and male adult beetles 164 



Plate 21. Chrysobothris tranquebarica: Adult male, dorsal view 164 



Life-History Observations on Four Recently Described Parasites of 

 Bruchophagus funebris 



Plate 22. A. — Liodontomerus perplexus: Adult female. B. — Eutelus bru- 



chophagi: Adult female 174 



Plate 23. A. — Trim,eromicrus maculatus: Adult female. B. — Liodontomerus 



secundus: Adult female 174 



