172 



ROLAND THAXTER ON THE 



185-189) ; but sometimes contain fatty globules of considerable size. The resting spores 

 often occur in specimens also producing conidia, and are commonly formed by lateral 

 budding from short hyphae in an apparently non-sexual fashion; but numerous in- 

 stances occur, as in E. sphaerosperma, where the budding is associated with a partition, 

 as in figs. 196, 198-199, which may perhaps indicate a sexual process. In a few cases 

 spores developing from long hyphae growing in the legs seemed to result from a process 

 which may with safety, I think, be considered a form of conjugation (fig. 197). 



The species has little that is peculiar in its structure and is only interesting as being 

 another example of the strongly marked sphaerosperma type. 



Empusa (Entomophthora) sphaerosperma (Fres.). 

 PI. 17, figs. 200-219. 



Entomophthora sphaerosperma, Fresenius I. c. A, p. 883; I. c. B, p. 207, Taf. ix, figs. 68- 

 78. Sorokin I c. C, p. 220, figs. 579-81, 586-90, 632-33, 654. Schroeter I. c, p. 223. 

 Tarichium sphaerospermum, Cohn I. c. B, p. 84. 

 Empusa radicans, Brefeld I. c. A; I. c. B, p. 14, Taf. i-ir. 



Entomoplithora radicans, Brefeld I. c. C; I. c. D. Nowakowski I. c. A; I. c. B, p. 165, 



Taf. x, figs. 63-67, Taf. xr, fig. 71. 

 Entomophthora Phytonomi, Arthur I. c. A; I. c. B. 



Conidia long-elliptical to nearly cylindrical; papillate at base and tapering very slightly 

 near the rounded apex; 15-26,* X 5-8 /Jt , average 20 X 5.5, j.; usually with a fine granular 

 contents and a central oval nuclear body. ConidiopJiores much branched and confluent 

 over the body of the host, forming usually a mass the upper surface of which is flattened. 

 Conidiophores digitate. Color of the fungus as a whole white, varying to bright pea 

 green. Cystidia slender, tapering, not abundant. Secondary conidia like the primary, 

 or long almond-shaped and borne on a capillary conidiophore. Resting spores, azygo- 

 spores or zygospores (?), borne laterally or terminally from hyphae; 20-35 /J( , average 

 25,*; spherical, hyaline or very slightly yellowish. Host attached to substratum by rhi- 

 zoids. 



Hosts. Lepidoptera: imago of Colias philodice; larva of Pieris. Hymenoptera: Ich- 

 neumonidae of several genera and species, a small bee (near Halictus). Diptera: imago 

 of Musca domestica (Brefeld), Musca sp. (Roan Mt., Thaxter) ; numerous small species 

 belonging to the Culicidae, My cetophilidae, Tipulidae and other families. Coleoptera: lar- 

 va of Phytonomus punctatus ; imago of one of the Lampyridae. Hemiptera: Aphis sp.] 

 several species of Typhlocyba (leaf hoppers), larvae, pupae and imagines. Neuroptera: 

 imago of Limnophilus (?) (Schneider). Thripidae: larvae, pupae and imagines of a 

 species of Thrips on Solidago. 



Habitat. Maine, New Hampshire, Massachusetts, New York, North Carolina, Eu- 

 rope. 



It is unnecessary to remark that this species is peculiar for the great diversity of its 

 hosts which include all insect orders, excepting only the Orthoptera. It is an extremely 

 common form, probably from this reason, and often produces epidemics of considerable 



