TH \ XTKR. — 



M()\()(JK.AIMI OF TUK LA BOULHKN I AC K.I') 



305 



present just below the tip, which IS abruptly narrower and slightly curved; the apex asymmetrical, the 

 posterior lip-cells forming a tripapillatc prominence, the middle papilla larger and more prominent; the 

 anterior lip-cells forming two small lateral papilla- placed side by side in such a position that the apex 

 appears to be laterally notched. Appendage erect or somewhat divergent, straight or slightly curved 

 backward, the stalk-cell more than twice as long as broad, and more than hall' united to the subtriangular 

 stalk-cell of the perithecium, distally constricted at its junction with the well differentiated squarish amber- 

 brown sterile basal cell of the appendage proper; the eight fertile cells above bearing two antheridia each 

 in addition to a terminal pair, the outer of which is spinose at its base, the series of antheridia external in 

 the mature types. Spores about 40-45 X 5 /i. Perithecium: venter 80-87 X 50 /«; neck 72-82 X 18 //. 

 Appendage proper 70 75 //, stalk-cell 25 30 /(. Receptacle 75 /(. Total length to tip of perithecium 

 270-290 p. 



On Dvypsis sp., Berlin Museum, No. 860; Bismarkburg, Togo, West Africa. On the upper sur- 

 face of the abdomen near the tip. 



This species is easily distinguished by the corrugated neck of its perithecium which is unlike that of 

 any known form. It is the fourth species of the family now known to inhabit these curious stalked-cycd 

 Diptera. The appendage is relatively large with very numerous antheridia, the multiplication of its cells 

 not being due to proliferation since the spinifcrous cell is terminal and appears to bear two antheridia 

 (fig. 10). 



STlGMATOMYCES gracilis Thaxter. Plate XLATI, figs. 15-18. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 403. March, 1901. 



Form long and slender. Venter of the perithecium amber-brown, relatively large above its narrow 

 base, more or less inflated, often more distinctly distally; the neck usually straight, sometimes curved, 

 Dearly hyaline as a rule, and abruptly distinguished; the tip abruptly but slightly narrower above a promi- 

 nent and usually symmetrical inflation; the median posterior projection of the lip-cells erect, larger, 

 and slightly more prominent than the two lateral ones, which diverge slightly and are nearly symmetri- 

 cal with the two anterior ones. Stalk-cell of the appendage slightly prominent distally below the dark 

 amber-brown basal cell, which may be more than half as large, bearing one or two antheridia; the remain- 

 ing cells four in number, relatively large, except the fourth, which bears a large, curved, conspicuous spine 

 below the base of the terminal antheridium; the antheridia in pairs, lateral or obliquely external, the 

 necks short, becoming pointed and slightly divergent. Receptacle usually shorter than the perithecium, 

 slender, straight or curved, hyaline; the two lower cells about equal, or the upper larger and distally 

 often broader than the combined diameters of the cells above it. Spores 45 X 3.5 fi. Perithecium : 

 venter 85-90 X 30-40 /x; neck 100-110 X 16 /* (the enlargement X 20 fi). Appendage 70-75 /x, stalk- 

 cell 18-25 ji. Receptacle 90-125 X 18-20 fi. Total length to tip of perithecium 250-360 fi. 



Near the tips of the posterior legs on the same host with S. dubius. Ralum, New Pomerania. Berlin 

 Museum, No. 1298. 



This species appears to be most nearly allied to S. Sarcophucjae , from which it is separated by its 

 general form, and by the structure of its appendage, which is not proliferous; the terminal antheridium 

 being subtended by an unusually large stout thorn-like spine. 



Stigmatomyces Scaptomyz.e Thaxter. Plate XLVI, figs. 37-41. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 400. March, 1901. 

 Venter of the perithecium becoming reddish amber-brown, nearly isodiametric, becoming distally 

 enlarged; the nearly hyaline neck very abruptly distinguished, slender, straight, or curved, its lower 

 third sometimes narrower; the tip hardly or not at all differentiated; the apex asymmetrical, the anterior 

 lip-cells forming two lateral papillate slightly divergent protrusions, the posterior lip-cells forming two 

 similar protuberances above them, between which a slight projection may or may not be present. Stalk- 

 cell of the appendage elongate, very abruptly broader than the very small deep brown squarish infertile 



