714 THAXTER. 



well defined, yellowish brown, concolorous with the rather stout 

 perithecium, which is subsymmetrical, somewhat straighter on the 

 outer side, rather evenly inflated throughout, and tapering to the 

 hardly distinguished, blunt or almost truncate tip and apex, a small 

 outer lip often forming a rather abrupt hj'aline prominence. Spores 

 about 22 X 2.5 /i. Perithecia 75-80 X 25 m; stalk-cell 35-50 X 11 m- 

 Appendage, longest axis, 175 /u; branches 70-100 )u. Receptacle 

 about 22 X 8 yu. Total length to tip of perithecium 140-160 [i. 



On the anterior legs of a large black Diopsis. No. 2302, Kamerun, 

 W. Africa. 



This species is most nearly related to R. confusiis and is of the same 

 general type, but has little of its graceful appearance owing to the 

 fact that its peculiar branchlets are coarse and more scanty and 

 hardly more than curved at the tips. Owing to a slight divergence in 

 their origin from successi^'e cells they tend to be two-ranked. The 

 perithecium also differs in being straight, or nearly so; and its stalk- 

 cell is not subtended by the prominence characteristic of E. confusvs. 

 The axis of the appendage resembles that of an undeveloped 

 Rhacliomyces. 



Ilytheomyces falcatus nov. sp. 



More or less conspicuously curved throughout. Basal cell abruptly 

 prominent below the insertion of the appendage, almost wholly in- 

 volved by the suffusion of the foot; subbasal cell larger, lying ob- 

 liquely beside and above it, hyaline. Axis of appendage divergent, 

 consisting of four or five hardly distinguishable cells, blackened 

 externally; the subbasal cell abruptly broader than the basal, and 

 bearing on its inner side the relatively large partly free androphorous 

 cell from which arises a single antheridium and a well developed 

 branch, usually bearing several stout curved hyaline-tipped branchlets; 

 the remaining cells of the axis bearing externally blackish brown, out- 

 curved, hyaline-tipped branches, and on the upper side a few stout 

 curved hyaline branches, tinged with brown and more slender below. 

 Stalk-cell of the perithecium hyaline, rather short, distally obliquely 

 separated from the much longer secondary stalk-cell, which lies paral- 

 lel to the narrower inner basal cell : the latter of about the same length, 

 but reaching higher, its narrow base in contact with the stalk-cell. The 

 stalk- and basal cell regions about as long as the rest of the perithe- 

 cium, the two lower tiers of wall-cells and the third (tip) distinguished 

 by very slight elevations, purplish brown, the surface mottled-granular, 



