4 THAXTER. 



that the two genera might have to be united (see These Proceedings, L, 

 p. 45). The genus Ceraiomyces was originally based on the diptero- 

 philous C. Dahlii from New Guinea, in which not only are cells III-V 

 replaced by a single cell but the appendage has the appearance of 

 being single, that is of arising from one basal cell. In this species, also, 

 a well de\eloped penetrating rhizoid is developed. What appears to 

 be the basal cell in this species should probably be regarded, however, 

 as the insertion-cell; the basal cells of the two branches which arise 

 from it, representing the basal cells of the typical outer and inner 

 appendage in Laboulbenia. A sufficient numlier of forms ha\"e now 

 accumulated on Diptera and Coleoptera which, taken in connection 

 with the two forms on Gryllus described below, make it evident that 

 Ceraiomyces had best be discarded. The forms which ma}' be included 

 in this general section represent a tendency toward the development of 

 a more simple receptacle, just as the aquatic species, and some others, 

 show a tendency toward greater complication than is present in the 

 type-forms. In one of the two closely allied species described below on 

 Gryllus, the black insertion-cell bears but a single basal appendage- 

 cell, while cell \^ is present and is proliferous in a fashion resembling 

 that seen in Laboulbenia proliferans. In the second species, which is so 

 closely allied that it might almost be regarded as a variety only, the 

 structure is exactly that of a typical Laboulbenia, although in both 

 the host is penetrated by a well developed rhizoid. The species here- 

 tofore described under Ceraiomyces may therefo're best be transferred 

 to Laboulbenia which will therefore include the following forms: 

 Laboulbenia Dahlii, L. Selenae, L. Epitricis, L. obesa, L. mi- 

 niscula, L. dislocata, L. Trinidadensis, L. Chaetocnemae, and 

 L. Nisotrae. 



Dimeromyces falcatus nov. sp. 



Male indiridual. Pale straw-yellow or nearly hyaline, consisting 

 of usually five superposed cells (four to eight) terminating in a small 

 unicellular appendage bluntly pointed, slightly tapering, about three 

 times longer than broad; the basal cell running into the large long 

 somewhat irregular foot, somewhat bent, about twice as long as 

 ])road, narrower above the foot, with a broad contrasting distal black- 

 ish brown band; the cells above usually successively somewhat smaller 

 or subequal, all or most bearing single antheridia more or less definitely 

 superposed, usually three to five in number. Antheridia long slender 

 colorless; the stalk-cell sometimes even longer than the venter and 



