THAXTER. — MONOGRAPH OF THE LABOULBENIACEJE. 3(1 
present just below the tip, which is abruptly narrower and slightly curved; tlu»aj» . asymmrtriral, the 
posterior lip-cells forming a tripapillate prominence, the middle papilla lai -rand men prominent ; tin 
anterior lip-cells forming two small lateral papilla* placed side by side in sucli a position that the ape\ 
appears to be laterally notched. Appendage erect or somewhat divergent, straight or slightly em i d 
backward, the stalk-cell more than twice as long as broad, and more than half united to the subtriangulur 
stalk-cell of the perithecium, distally constricted at its junction with die well differentiated squ; )\ amber 
brown sterile basal cell of the appendage proper; the eight fertile cells above bearing two antl • ridia each 
in addition to a terminal pair, the outer of which is spino.se at its base, the scries of antheridia e\t< ual in 
the mature types. Spores about 40-45 X 5 \i. Perithecium: venter SO s7 x M) i'\ neck 72 S2 X ISp 
Appendage proper 70-75 \t, stalk-cell 25-30 fL Receptacle 75 ft. Total length to tip of perithelium 
270-290 pu 
On Diopsis sp., Berlin Museum, No. 860; Bismarkbuig, Top West Africa. < ta the upper sur- 
face of the abdomen near the tip. 
This species is easily distinguished by the corrugated neck of it.s perithe* ium irhich is unlike that of 
any known form. It is the fourth species of the family now known to inhabit these curious stalked-* d 
Diptera. The appendage is relatively large with very numerous antheridia, tin multiplication of its eellf 
not being due to proliferation since the spiniferous cell is terminal and appears to hear two antheridia 
(fig. 10). 
Stigmatomyces gracilis Thaxter. Plate XLVII, fig-. 15 I s - 
Proc. Am. Acad. Arts and BcL, Vol. XXXVI. p. 403. March, 1901. 
Form long and slender. 
ambe 
base, more or less inflated, often more distinctly distally; the neck usually straight, sometimes ctmed, 
nearly 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-eells erect, larger, 
and slightly more prominent than the two lateral ones, which diverge slighth and arc 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 i large, carved, eeosptcttous spine 
below the base of the terminal antheridium; the antheridia in pairs, lateral or obliquely external, the 
- m a . a • 
necks short, becoming pointed and slightly divergent, 
slender, straight or curved, hyaline; the two lower cc 
often broader than the combined diameters of the cells above it. Spon 15 X 3.5 /i. Penthectum : 
Re 
pper 
lislallv 
85-90 X 30-40 u: neck 100-110 X 16 u (the enlargement X 20 a). Appendage 70 75 
cell 18-25 ft. Receptacle 90-125 
P 
Near the tips of the posterior legs on the same host with S. dubh,. Kahim, New Pomcrania. Berlin 
Museum, No. 1298. 
general form, and by the structure of its appendage, which is 
being subtended by an unusually large stout thorn-like spine. 
Stigmatomyces Scaptomyz.e Thaxter. 
terminal 
37-41 
Proc. Am. Acad. Arts and Set, Vol. XXXVI. p. 400. March, H0L 
Venter of the perithecium becoming reddish amber-brown, nearly isodiani.tr 
ii rv 
asvminc 
enlarged; the nearly hyaline neck very abruptly 
third sometimes narrower; the tip hardly or ,.w «- — - - # 
lip-cells forming two lateral papillate slightly divergent protrusions, the P < tenor hp- 11 forming t o 
similar protuberances above them, between which a slight project** may or may not be preaent talk- 
cell of the appendage elongate, very abruptly broader than the very small deep brown souansh mf.rtile 
