NEW DIMORPHOMYCETEAE. 281 



Dimeromyces 1-flagellatus nov. sp. 



Male individual colorless, the axis straight, three-celled, the basal 

 cell very large, of nearly uniform diameter; the subbasal usually 

 smaller than the basal cell of the appendage, which is obliquely 

 separated from it: both cells more often bearing slender, somewhat 

 divergent antheridia, slightly curved outward throughout; appendage 

 evanescent, slender, two-celled. Axis (three cells) 25-30 X o.o. /x- 

 Antheridia 25 X 4 /x. Basal cell 20 X 5.5 n. 



Female individual erect, straight nearly hyaline. Receptacle 

 consisting of five-cells, the basal very large, sometimes longer than the 

 rest combined, the second or third cell bearing the single sessile peri- 

 thecium; the two oblicjuely separated, subequal, more flattened than 

 the two above; all separated by slight marginal indentations; the 

 subbasal often cutting off a small cell distally and anteriorly; the 

 only appendage primary, terminal, slightly divergent, somewhat 

 moniliform and reddish brown below; its basal cell large, usually 

 slightly concave externally, the subbasal very small almost square, 

 more deeply suffused, the two or three cells above larger, more rounded, 

 somewhat less suffused; the three to five distal cells pale, the terminal 

 one usually much longer. Stalk of the perithecium usually MhoUy 

 undistinguished, straight, an external elevation often submedian, 

 thence tapering asymmetrically to the blunt termination, the outer 

 lip-cell large and somewhat spoon-shaped, lying over the inner. 

 Spores (female) 28 X 2.5 /x. Perithecia 50-60 X 13 ju. Appendage 

 75-90 Id. Total length to tip of perithecium 95-105 ix. Basal cell, 

 largest 42 X 10 /x. 



On the head and prothorax of SjMnf/ovosto.v alter Burr. Porto 

 Yehlo, Amazon, Mann Coll., No. 2242, M. C. Z. 



This peculiar species differs in the absence of any secondary ap- 

 pendages, in its elongate basal cell and usually quite sessile perithe- 

 cium. The appendage of the male has only been seen in a shriveled 

 condition, and is quickly destroyed. The antheridia may be solitary 

 or more often two superposed, and are slender, with long attenuated 

 necks. 



Dimeromyces Thaxteri Maire. 



This very peculiar and somewhat anomalous species which was first 

 observed on Gryllus from Java, and inadvertently described by me 



