702 THAXTER. 



once distinguished by its greater size, the presence of a penetrating 

 rhizoid and the conformation of its perithecium. 



On Nycteribiidae. 



Stigmatomyces Nycteribiidarum nov. sp. 



Hyaline, becoming pale yellowish. Basal cell of the receptacle large 

 and stout, about three times as long as broad and nearly uniform, 

 developing no foot, and penetrating the host by means of a well devel- 

 oped rhizoid; subbasal cell relatively small, misplaced by the primary 

 stalk-cell of the perithecium, which lies obliquely beside it. Stalk 

 cell of the appendage hardly as long as broad, its basal septum some- 

 what oblique, its outer margin convex, slightly prominent below the 

 broad insertion. Basal cell of the appendage somewhat brownish, 

 especially below, slightly broader and evenly rounded distally, the 

 margins slightly concave, the structure of the appendage as a whole 

 like that of S. Strcblae. Subbasal cell of the receptacle and the pri- 

 mary and secondary stalk-cells of the perithecium more or less similar 

 in size, associated obliquely side by side, and forming a somewhat 

 oblique series; the primary stalk-cell partly in contact wuth the basal 

 cell of the receptacle, the secondary stalk-cell somewhat broader and 

 larger; the region occupied by the two combined externally strongly 

 convex, bulging outward below the concave outer margin of the outer 

 basal cells, which are subequal and smaller: venter stout, straight, 

 erect, but slightly inflated below the middle; the wall-cells having a 

 twist of about one fourth of a turn, forming four corresponding termi- 

 nal ridges which serve abruptly to distinguish the stout neck; the 

 latter nearly uniform in width, or slightly spreading at the base; the 

 tip abruptly distinguished, bent very slightly outward, slightly taper- 

 ing to the large, blunt, somewhat asymmetrically rounded extremity. 

 Spores about 25 X 3.5 )U, the shorter basal segment tapering to a slen- 

 der point. Perithecia 190-215 /z; venter 110-120 X 45-54 )u; neck 

 70 X 22 fx. Appendage about 50 X 20-24 /x. Basal cell of the re- 

 ceptacle 85-105 X 30-35 fx. Total length to tip of perithecium 330- 

 365 fx. 



On the inferior abdomen of a Nycteribid parasitic on Antibaeus 

 Grenadinus, M. C. Z., (Brues), No. 2057. 



A species closely allied to the preceding, from which it differs in 

 its greater size, the form of its perithecium, and the basal cell of 



