THAXTER. — ARGENTINE LABOULBENIALES. 217 



In general habit this species is not iinhke C. nii>n\iculu.s from which 

 it is at once (Hstinguished by its large perithecial appendage. 



Ceratomyces intermedius nov. sp. 



Receptacle faintly tinged with amber-brown, rather short, externally 

 opaque abo\e the basal cell to the base of the appendage, the blacken- 

 ing involving the outer half or less of the cells concerned; the cell sub- 

 tending the appendage slightly prominent externally, below the latter. 

 The perithecium and appendage usually divergent at the base of the 

 latter, which is faintly tinged with amber-brown, stout, curved out- 

 ward; consisting of a series of cells smaller distally, about six of the 

 lowest very broad and flattened, becoming divided more or less irregu- 

 larly by oblique partitions, and bearing a few scattered branchlets 

 on the inner side. Perithecium large, stout, deeply tinged with dull 

 amber-brown, paler at the base where it is distinctly narrower, the 

 distal two thirds of nearly the same diameter throughout, or the middle 

 third somewhat inflated; the tip short abruptly distinguished exter- 

 nally, being subtended by a rounded prominence in which the series 

 of wall-cells below it ends, its apex hyaline, asymmetrically rounded 

 or outwardly oblique; the simple perithecial appendage becoming 

 deeply suffused or opaque except at its bluntly pointed tip, erect or 

 bent inward, consisting of from about six to eight successively smaller 

 cells, the lower becoming deeply suffused; the basal cell very large, 

 concave within, convex externally, the whole assuming a sigmoid 

 curvature as it matures. Perithecium 310-390X80-105 ju, the base 

 50-60 m; the appendage 105-170 m- Receptacle 74-82X75-78//, 

 without foot (30 n). Appendage 200X45^8 ai at base. Total length 

 to tip of perithecial appendage 660 /x. 



On the left anterior margin of the thorax of Tropisternus sp. ; Pal- 

 lermo, near Belgrano, No. 1946. 



A large and clearly distinguished species, intermediate between 

 C. mirabilis, which it more nearly resembles in its perithecial char- 

 acters, and C. dadophorus, which has a similar though somewhat 

 more highly developed appendage. 



Synaptomyces nov. gen. 



Receptacle indeterminate, consisting of a series of superposed cells; 

 the uppermost of this series followed by two cells placed side by side, 

 one of which is separated by a single small cell from the basal cell of 



