EXTRA-AMERICAN LABOILBENIALES. 745 



gated by about eight successive elevations, usually more conspicuous 

 in the distal half; the tip distinguished by an abrupt inflation, short, 

 slightly tapering; the apex much shorter, rather broad and blunt, 

 straight or slightly bent, usually turned so as to appear symmetrical, 

 with a median elevation, or oblique when seen sidewise. Spores, 

 about 45 X 4 ^. Perithecia, stalk- and basal cell portion 100-210 ijl X 

 30-35 /x; venter 90-105 X 30-38 /z; neck 122 X 20-28 /x or less; tip 

 and apex 25-30 X 12 ^i distally. Appendage 100-125 X 15 m at 

 base; stalk-cell 50-60 X 14-18 m-' Receptacle 250-280 X 32 m- Total 

 length 740 or less X 35-40 fj.. 



On the upper surface of the abdomen of a large black fly belonging 

 to an undetermined genus of the Ortalidae. Kamerun, W. Africa, 

 No. 2721. 



A large species well distinguished by its elongate slender form, 

 suffused basal cell, slender tapering appendage, corrugated neck etc. 

 The twist in the wall-cells of the venter and neck is often conspicuous, 

 though sometimes hardly apparent, and increases with age, as does. 

 the corrugation of the neck. 



On Oscinidae. 



Stigmatomyces constrictus Thaxter. 



Specimens of this variable species, with and without the charac- 

 teristic constriction of the receptacle, have been examined from 

 Kamerun on Anatrichus erinaceus, No. 2644, and on other genera of 

 the Oscinidae, Nos. 2650, 2652, 2726, 2727, 2728 and 2729. 



On Trypetidae. 



Stigmatomyces Dacinus nov. sp. 



Habit rigid, erect, straight or somewhat curved throughout, the 

 walls relatively thick. Basal cell of the receptacle slightly tinged 

 with brownish yellow, tapering to the pointed foot; the subbasal cell 

 twice as long, or less, hyaline, of nearly uniform diameter. Stalk-cell 

 of the appendage narrow, somewhat curved inward, about as long as 

 the subbasal cell, which it overlaps from one quarter to one half; 

 distally twice as broad as the insertion which lies distinctly above 



