660 THAXTER. 



kindly communicated to me by Professor Melander, is most nearly 

 allied to the species which occur on flies of the genus Limosina, its 

 indeterminate appendage corresponding closely to that of S. Limo- 

 sinae, and similarly developed through the activity of a terminal 

 cell, which separates successive basal segments to form the axis. Its 

 type is quite unlike that of S. Drapctis, the only other form which has 

 thus far been observed on Empididae. 



On Borboridae. 



Stigmatomyces longicollis nov. sp. 



Nearly hyaline, the venter and its basal cells, together with the 

 basal cell of the appendage, only, suffused with pale yellowish brown. 

 Basal cell of the short receptacle slightly longer than the subbasal, 

 which is hardly longer than broad. Stalk-cell of the appendage 

 somewhat prominently rounded outw^ard below the broad insertion 

 of the appendage. Appendage consisting of not more than eighteen 

 or nineteen very obliquely superposed cells, long and slender, tapering; 

 the basal cell flat and disc-shaped, the distal septum hardly oblique, 

 narrower than the subbasal; which projects beyond it and, like those 

 above, is flattened-elliptical in outline, with strongly convex outer 

 margin; the lower cells bearing two, the upper single antheridia on 

 their inner sides; the long necks appressed, the uppermost more or less 

 abortive. Stalk-cell of the perithecium, in size and shape, not unlike 

 that of the appendage inverted, and lying beside it; the secondary 

 stalk-cell somewhat srnaller and shorter, its inner margin in oblique 

 contact with it; the basal cells more or less similar and uniform, the 

 region usually very slightly broader than the base of the venter: the 

 venter slightly and symmetrically inflated, passing without differentia- 

 tion to the broad base of the neck, which is enormously elongated, 

 relatively slender and of nearly uniform diameter above its base: 

 the tip distinguished by a slight but distinct depression of the outline 

 on either side; the very short apex narrowing to a small, blunt, sym- 

 metrical or slightly oblique, obscurely papillate extremity. . Spores 

 18-20 X 2.5 M- Perithecia 245^50 V; the venter 56 X 36-35 X 

 26-30 m; the neck 190-380 X 14 m; the tip and apex 22 /x. Append- 

 age 90-120 M- Receptacle 40-45 X 18-20 fjL. Total length to tip of 

 perithecium 300-525 fx. 



On the posterior legs and abdomen of species of Limosina. No. 



