706 THAXTER. 



as large as that of the outer, somewhat prominent, bearing two 

 appressed branches, the basal cells of which bear one or two dark 

 brown antheridia and several short dark sterile branchlets one of 

 which may be hyaline and similar to those of the outer appendage. 

 Basal cells of the perithecium concolorous with cell VI and indis- 

 tinctly punctate; the region very broad, surrounding the base of the 

 ascigerous cavity, and forming a very broad insertion for the base of 

 the dark olive brown perithecium; which tapers irregularly, the two 

 lower tiers of wall-cells distinguished by dark lines, the second rather 

 abruptly narrower and tapering, forming a more or less distinct neck- 

 portion ; the tip and apex slightly bent outward, abruptly paler, some- 

 what broader, tapering to the well defined, but not very prominent, 

 lips; the inner subtended by a darker suffusion, and not more promi- 

 nent than the outer. Spores 35 X 3 /x. Perithecia 95 X 28 ju at the 

 base. Appendage, longest, 140-157 ^i. Cell III-V, longest 40 X 15 /x, 

 shortest 25 ;u. Total length 175-210 jx. 



On the superior surface of the abdomen near the tip, of a small fly of 

 unknown family. No. 2651, Kamerun, \Y. Africa. 



The host of the very peculiar species was unfortunately lost in the 

 mails, but the characters of the parasite are so distinct that its identi- 

 fication is of less importance. The species is most nearly related to 

 Laboidhcnia {Ccraiomyccs) Dahlii, although it does not penetrate the 

 host by haustoria, and has a quite different appendage. The form of 

 its perithecium, tapering from a very broad base, is very similar, as 

 well as the elongation of cell III-V, which, however, is much more 

 extreme. The branchlets of the appendage which projects far out- 

 ward at nearly a right angle to the axis of the receptacle, recall those 

 of L. pcctinidifera, showing the same tendency to produce rounded, 

 short, tooth-like projections from their under sides. This character 

 is not so well marked, however, and more irregular. 



Laboulbenia pectinulifera nov. sp. 



Quite hyaline below the venter and insertion-cell or becoming faintly 

 brownish, usually slightly curved, especially at the base. Foot normal, 

 large, associated with a slight swelling of the basal cell above it, or, 

 when on the wing, small, associated with a narrow black contact- 

 induration of the abruptly curved base of cell I; cell II of about the 

 same length and often separated by a slight indentation; cells III-V 

 replacefl by a single cell, the extremity of which is free on the inner side 



