THAXTER. NEW LABOULBENIACEAE. 399 



thickening on the inner side of its wall at the base ; the fertile cells above 

 it, four or five in number, bearing the rather large antheridia in pairs ; 

 the series becoming obliquely lateral or external, the free necks strongly 

 curved outward. The cells of the receptacle nearly equal, or the upper 

 larger; the basal cell tapering to the foot and distally slightly broader 

 than the subbasal cell. Spores about 40 X 4 //.. Perithecium : venter 72 

 X 45 jx ; neck 62-72 X 15-18 /u. Appendage proper 60-70 fx, stalk- 

 cell 18 (i. Receptacle 90-100 X 20 fi. Total length to tip of perithe- 

 cium 250-290 fi. 



On the legs, thorax, and abdomen of a minute fly. Berlin Museum, 

 No. 1296. Ralum, New Pomerania. 



A form from the same locality occurring on a small blackish fly, and 

 also characterized by a roughened perithecium, differs in several points 

 from that above described ; but a description of this, as well as of a 

 closely allied form from Kittery Point, Maine, is withheld for the present. 



Stigmatomyces Diopsis nov. sp. 

 Colorless or slightly yellowish. Venter of the perithecium long-oval 

 or elliptical, pale reddish amber, rather abruptly distinguished from the 

 paler neck, which tapers but slightly, except at its base, is straight or 

 slightly bent, and traversed by four broad longitudinal ridges which are 

 corrugated by about six successive elevations and depressions ; a seventh 

 distal elevation, larger and more prominent than the rest, is present just 

 below the tip, which is abruptly narrower and slightly curved ; the apex 

 asymmetrical, the posterior lip-cells forming a tripapillate prominence, 

 the middle papilla larger and more prominent ; the anterior lip-cells form- 

 ing two small lateral papillae placed side by side in such a position that 

 the apex appears to be laterally notched. Appendage erect or some- 

 what divergent, straight or slightly curved backward, the stalk-cell more 

 than twice as long as broad, and more than half uuited to the subtriangu- 

 lar stalk-cell of the perithecium, distally constricted at its junction with 

 the well differentiated squarish amber-brown sterile basal cell of the ap- 

 pendage proper; the eight or nine fertile cells above bearing for the 

 most part two antheridia each, the series of antheridia external in the 

 mature types. Spores about 40-45 X 5 fi. Perithecium : venter 80-87 

 X 50 [x ; neck 72-82 X 18 /x. Appendage proper 70-75 /x, stalk-cell 

 25-30 ju. Receptacle 75 fx. Total length to tip of perithecium 270- 



290 fx. 



On Diopsis sp., Berlin Museum, No. 860. Bismarkburg, Togo, West 

 Africa. On the upper surface of the abdomen near the tip. 



