410 PROCEEDINGS OF THE AMERICAN ACADEMY. 



On the upper surface near the tip of the abdomen of a species of 

 Diopsis. Berlin Museum, No. 850. Tanga, Africa. 



CERAIOMYCES nov. gen. 

 Structure of peritliecium as in Laboulbenia, its stalk-cell united to the 

 free base of the free stalk-cell of the appendage, which bears a well differ- 

 entiated basal cell terminally, from the end of which are borne antheridial 

 branches, the successive cells of which produce terminally either succes- 

 sive secondary branchlets or antheridia or both, much as in Laboulbenia. 

 Receptacle two-celled. 



Ceraiomyces Dahlii nov. sp. 



Perithecium large, blackish brown, with an olive shade, becoming opaque, 

 usually slightly curved, tapering gradually to the slender undifferentiated 

 tip ; the anterior lip-cells forming two appressed hyaline-tipped finger- 

 like projections ; the base very broad, translucent, dull brownish, bulging 

 conspicuously below the venter, especially on the left side ; the stalk-cell 

 small, nearly isodiametric, united on its inner side to the base of the stalk- 

 cell of the appendage. The latter free, though often in contact with the 

 base of the perithecium, dull blackish olive, outwardly inflated, narrower 

 terminally where it bears the characteristically differentiated basal cell of 

 the appendage, which becomes almost opaque and is somewhat flask- or 

 bottle-shaped with a rounded extremity, from which, typically, two diver- 

 gent branches arise which in turn may branch one to three times sub- 

 dichotomously ; the long slender flask-shaped antheridia borne, one to two 

 together, distally from the successive cells. The basal cell of the recep- 

 tacle nearly spherical, penetrating the host by a long filament which is 

 slender except for an enlargement immediately below the integument of 

 the host, simple at first but becoming more or less copiously branched; 

 the upper cell very large and elongate. Spores about 30 X 3 ^u. Peri- 

 thecium 275-310 X 55-60 ju; the base, including the stalk-cell, 68-72 X 

 58-68 |U. Appendage 75-85 /x (the basal cell 18 X 12 /x), the stalk-cell 

 40-45 X 18-22 /A. Receptacle 175-240 x 35ya (the basal cell 20-22 /x). 

 Total length to tip of perithecium 400-675 fx, average 550 /x. 



On various parts of a small flower fly. Ralum, New Pomerania. 

 Berlin Museum, Nos. 1283 and 1298. Occurring more often on the head, 

 where it might be mistaken for a dipterous antenna. 



Dimeromyces coarctatus nov. sp. 

 Male Individual. Receptacle nearly hyaline, consisting of usually 

 three superposed cells, the upper separated by a dark-colored constriction 



