220 THAXTER. 



ing beneath the stalk-cell of the lowes't antheridium. Appendage of 

 two stout subequal cells, the upper much thickened distally, and 

 rounded or flattened and somewhat blackish. Antheridia one or 

 often two, straight, erect or slightly divergent, sessile or nearly so, 

 the stalk-cell clearly defined, the venter relatively large, stout and 

 abruptly distinguished from the broad efferent tube region; the neck 

 very short and stout, almost obsolete. Antheridia 23-26 X 9.5-11 ju- 

 Appendage 13 ix. Receptacle 25-27 X 10 /x. Total length to tip 

 of antheridia 45-50 ijl. 



Feviale individual becoming tinged with brownish yellow, a clearly 

 defined and usually contrasting blackish brown area involving the 

 upper half or more of the basal cell proper and the adjacent lower 

 half of the subbasal cell, sometimes also the lower cell of the second- 

 ary axis : the basal cell proper forming a well defined rather abruptl}' 

 distinguished short stalk. Primary appendage usually two-celled, 

 the cells nearly equal, stout with blackish shades about the septa, 

 distally rounded, the walls thickened. Secondary receptacle of six 

 to twelve cells, the series diverging at an angle of about 45°, usually 

 straight and rigid, more rarely slightly curved, slightly tapering, 

 distally bluntly rounded; producing from one to four perithecia, 

 alternating with much shorter two-celled stout secondary appendages; 

 their distal cells tapering very slightly, with rather broadly rounded 

 terminations. Perithecia long fusiform the stalk hardly distinguished; 

 the tip reddish brown, often distinguished by a slight depression when 

 fully mature; the apex slightly broader, flattened or rounded, the 

 inner margin slightly more prominent. Perithecia 75-106 X 16-20 /x. 

 Primary appendage 23-2S X 10-11.5 m. Secondary 33-42 X 11.5 ;u. 

 Secondary receptacle 30-55 X 12-13 ix. Primary basal cell 9 n. 



On the abdomen of Erchomus (Coproporns) sp.? No. 1662, Mande- 

 ville, Jamaica. Xo. 1652, Los Amates, Guatemala. No. 2228, 

 Amazon (Mann). 



This species is most nearly related to D. Mynnrdoniar, which differs 

 in its brown subcylindrical perithecia, longer secondary appendages, 

 in the absence of a conspicuous blackish suft'usion of the basal cell- 

 region, so conspicuous in the present species; but especially in the male, 

 which in D. brerirostris is clearly defined by its blackish suffusion, and 

 the almost obsolete neck of its antheridium. 



Dimorphomyces Eleusinus nov. sp. 



Male indii'idiidl tinged with pale brownish yellow, the neck of the 

 antheridium reddish brown. Receptacle two-celled; the appendage 



