THAXTER. — NEW LABOULBENIACEAE. 401 



pering slightly downward, the subbasal cell slightly longer and much 

 broader distally. Perithecium : venter 55 X 30^; neck 75 X 10^. 

 Appendage about 75-80 /x, stalk-cell 28 /x. Receptacle 110 X 25 fx. Total 

 length to tip of perithecium 250-275 fx. 



On the inferior surface of the abdomen and at the base of the posterior 

 legs of a species of Limnophorus. Berkeley, California. 



Stigmatomyces constrictus nov. sp. 



Venter of the perithecium dark amber brown, subrectangular, or more 

 or less inflated ; the short stout neck about equal to it in length, very 

 abruptly distinguished beyond the four rounded elevations which mark 

 the distal ends of the brown wall-cells of the venter, subconical, with a 

 considerable submediau enlargement often more prominent posteriorly ; 

 the tip often tapering to the five-papillate apex, the middle posterior papilla 

 blunt and more prominent, the other four nearly symmetrical. Stalk- 

 cell of the appendage often suboblong and externally prominent through- 

 out its length ; the basal cell narrower and longer, separated from it by a 

 rather deep constriction and bearing one or two antheridia distally ; while 

 above it the two remaining fertile cells are very small, each bearing two 

 antheridia; the series surmounted by a spiniferous autheridium, all the 

 antheridia relatively large and almost free. Receptacle hyaline, its basal 

 cell more or less elongate, tapering to a narrow base, a rectangular distal 

 thicker walled portion separated by a thin incomplete se{)tum ; the sub- 

 basal cell much shorter, more or less abruptly and prominently inflated 

 at its base, sometimes slightly also at its distal end, and having a more or 

 less well defined median constriction, below which the inflated base may 

 be separated by a thin partial septum, Perithecium : venter 54 X 30- 

 40 /x; neck 44-55 x 18 /x. Appendage 43-50 /x, the stalk-cell 18 /x. 

 Receptacle 70-90 x 22 /z. Total length to tip of perithecium 200-300 /* 

 (those on the tips of the legs much smaller, 180-200 /a). 



On the legs and abdomen of a small fly. Ralum, New Pomerania. 

 Berlin Museum, No. 1294. 



Stigmatomyces humilis nov. sp. 



Venter of the perithecium amber brown, slightly inflated throughout 

 and slightly asymmetrical ; the neck rather abruptly distinguished, con- 

 colorous, but paler distally, generally shorter than the venter, stout, 

 tapering to the blunt, hardly differentiated apex ; about one third of its 

 length taken up by the tip, which is distiuguislied from it by a slight 

 broad constriction ; the outer basal cells subeijual and irregularly prumi- 

 VOL. XXXVI. — 26 



