NEW LABOULBENIALES. 701 



upper (inner) surface: the necks of the latter thick and gelatinous, 

 becoming more or less completely disorganized, their venters, together 

 with the cells from which they arise, becoming so closely iinited that 

 they appear as a compact cellular mass. Stalk-cell of the perithecium 

 of somewhat rounded flattened outline, obliquel}^ placed, smaller than 

 the subbasal cell and in contact below with the basal cell of the recep- 

 tacle; its outer margin short and straight; secondary stalk-cell 

 larger, more rounded, externally strongly convex: basal cells small: 

 venter very slightly inflated, somewhat longer than the distal portion, 

 bearing distally four discrete, rather conspicuous, tubercle-like promi- 

 nences, which serve abruptly to differentiate the venter from the distal 

 portion of the perithecium; the latter somewhat bent inward, and 

 geniculate at the junction of the tip with the neck; which is rather 

 stout, hardly tapering, the base spreading slightly ; the tip clearly dis- 

 tinguished by the abrupt convergence of the outer margin from its 

 junction with the neck: the apex snout-like, small, bent slightly out- 

 ward, its distal margin flat or slightly rounded, the lips hardly if at 

 all distinguished. Spores 28 X 3.5 fx, the lower segment relatively 

 very short and blunt. Perithecia 95-105 n; the neck about 35 X 16 m, 

 the venter 50-56 X 24-28 fx. Appendage 28 X 18 m- Receptacle 

 65-80 X 16-20 M. Total length 170-200 m- 



On the legs and wings of Strebla vespertilionis Fabr., collected on 

 bats in Venezuela (Carricker), No. 2073b, M. C. Z. 



This species, as well as the following, is rather clearly distinguished 

 from other members of the genus by the characters of the appendage, 

 but I have, thought it undesirable to erect a new genus for its reception 

 in view of the fact that such a genus would practically be based on the 

 fact that the ahtheridia, where they occur in pairs, are independent, 

 and do not appear to arise, as is normally the case in this genus, 

 through the transformation of the cell which bears the primary an- 

 theridium to a secondary antheridium, on which the primary one 

 appears to be borne. The same variation in relation sometimes occurs 

 in the genus Corethromyces, although here, also, the normal develop- 

 ment and association of the antheridial groups is like that of the more 

 highly developed typical species of Stigmatomyces. In the present 

 type, as a result of the gelatification of the thick antheridial necks, the 

 mature appendage has an unusual appearance, and would hardly be 

 recognized as of the Stimatomyces-type; the cells closely cohering in 

 a compact mass. The general structure of the appendage seems to be 

 identical in both this and the following species, which also occurs on 

 a dipterous parasite of bats; and is closely allied, altliough it is at 



