82 



Mycologia 



Lakon, G. 1919b. Bemerkungen uber die Uberwinterung von Empusa muscae. 



Zeit. f. Angew. Ent., Bd. V, p. 287, 1919. 

 Leidy, J. 1850. (Note on fungus disease of Cicada septendecim.) Proc. 



Acad. Nat. Sci. Philadelphia, Vol. 5, 1850-51, p. 235. 

 Marlatt, C. L. 1907. The periodical cicada. Bull. 71, Bur. of Ent. U. S. 



Dept. Agri. 



Peck, C. 1879. Massospora cicadina n.g. et sp. Thirty-first Report of State 

 Botanist of New York, p. 44. 



Speare, A. T. 1912. Fungus parasites of insects injurious to sugar cane. 

 Bull. 12, Path. Ser. Hawaiian Sugar Planters' Experiment Station, Hono- 

 lulu, Hawaii. 



Speare, A. T. 1919. The fungus parasite of the periodical cicada. Science, 



n.s., Vol. I, No. 1283, p. 116, August, 1919. 

 Thaxter, R. 1888. The Entomophthoreae of the United States. Mem. Bost. 



Soc. Nat. Hist., Vol. IV, No. VI, p. 190. 



Explanation of Plates 

 Plate 5 



Fig. 1. Specimens of Tibicina septendecim showing the conidia of Masso- 

 spora cicadina. Although certain organs of these insects were removed arti- 

 ficially, the abdomen with the attached fungus mass is shown in each instance 

 exactly as it was observed in the field. Fig. 1A is a female individual and 

 shows an unusually large conidial mass. X 1. 



Fig. 2. Specimens of Tibicina septendecim showing the resting spores of 

 M. cicadina. In Fig. 2A a portion of the anterior four abdominal segments 

 were removed artificially. Fig. 2B shows the fungus mass within the abdomen, 

 viewed from a posterior position. X 1. 



Plate 6 



Figs. A, E, F. Conidia of Massospora cicadina. X 1048. 

 Figs. B, C, D. Conidia germinating. X 568. 



Fig. G. Optical cross section of conidium showing its thick wall. X 1048. 

 Fig. H. A group of conidiophores. X 568. 



Figs. I, J, K, L. Selected conidiophores showing the method of formation 

 of the conidia. X 568. 



Fig. M. Gourd shaped hyphal bodies associated with the resting spore con- 

 dition. X 268. 



Figs. N, O. Young resting spores with hyphal bodies attached. X 268. 

 Figs. P, S. Young resting spores with hyphal bodies attached. X 532. 

 Fig. Q. A stage in resting spore development intermediate between those 

 shown in Figs. P and T. X 532. 



Fig. R. Apparently an encysted hyphal body. X 532. 

 Fig. T. Mature resting spore. X 568. 



Figs, U, V. Hyphal elements of unknown origin and function found asso- 

 ciated with the resting spore condition. X 568. 



Fig. W. A portion of one of the tube-like genital organs, showing resting 

 spores and hyphal bodies adhering. X 62. 



Fig. X. Optical cross section of a resting spore in about the stage of de- 

 velopment shown in Fig. Q. X 532. 



