NEW LABOULBENIALES. 659 



dium which seldom persists in older individuals, breaking readily from 

 its very narrow insertion, even in less fully matured specimens. It 

 is of a type quite unlike that of S. Clinoccrac, which is the only other 

 species as yet observed on flies of this family. 



Stigmatomyces Clinocerae nov. sp. 



Perithecium with its three basal cells and the basal cell of the 

 appendage suffused with amber-brown; the neck-portion paler, the 

 remaining cells hyaline or nearly so. Receptacle relatively slender, 

 of nearly uniform diameter, or somewhat tapering, the basal cell as 

 long as the subbasal, or not more than half as long. Stalk-cell of the 

 appendage hardly broader distally, about twice as long as broad, its 

 base oblique, occupying somewhat less than half the distal end of the 

 subbasal cell; its distal end but slightly broader than the insertion. 

 Appendage straight, or slightly curved inward ; consisting of as many 

 as eighteen cells, more often of about fourteen, obliquely superposed, 

 nearly equal in size, broader than long, externally strongly convex, 

 and thus separated by prominent indentations; the basal cell slightly 

 larger and deeply suffused, the rest hyaline, each bearing a single 

 antheridium; the antheridia obliquely superposed in a single series, 

 usually turned inward, the necks appressed, the venters about as large 

 as the cells which bear them ; the series terminated by a single antheri- 

 dium, often abortive. Stalk-cell of the perithecium vertically elon- 

 gated, parallel to the stalk-cell of the appendage and similar, though 

 somewhat broader; the cells above it somewhat smaller, subequal; 

 the secondary stalk-cell very obliquely separated from the primary 

 stalk-cell, tapering downward to a pointed base which ends slightly 

 below the middle of the latter. Venter of the perithecium much 

 broader than the basal cell region, symmetrically and considerably 

 inflated below, tapering considerably distally to the hardly distin- 

 guished neck; which is slightly shorter than the venter, slightly 

 curved and tapering; the tip and apex not distinguished, slightly 

 geniculate, relatively long, tapering to a blunt hyaline unmodified 

 termination. Spores IS X 2.8 m- Perithecia 140-170 X 30-36 m- Ap- 

 pendage, longest 74 X 8-10 m- Receptacle 60-88 X 14-18 //. Total 

 length to tip of perithecium 260 jj., the longest 300 ^i. 



On the inferior abdomen of Clinocera binotafa Loew. No. 2503, 

 Tecoma, Washington. 



This very distinct species, which was obtained from a host very 



