NEW LABOULBENIALES. 665 



antheridia; the series of antheridial necks hardly diverghig from 

 one another. Stalk-cell of the perithecium relatively large and long, 

 its outer half free, the pointed base of the secondary stalk-cell ex- 

 tending down beside its outer upper half, irregularly triangular, and 

 much smaller; of the three basal cells, the inner extends lower than 

 the others beside the distal end of the secondary, to the upper margin 

 of the primary stalk-cell. Venter of the perithecium more deeply 

 suffused, nearly symmetrical, its outline abruptly convex above the 

 relatively narrow base, then somewhat concave, then abruptly convex 

 and broader; so that the distal half, or less, appears to be rather 

 abruptly inflated; the terminations of the wall-cells swollen, and 

 separated by depressions; the neck abruptly distinguished, long, its 

 base slightly broader and spreading, otherwise of about the same 

 diameter throughout, or slightly broader distally; the tip slightly 

 bent, distinguished by an abrupt depression and elevation of its out- 

 line, not quite symmetrical on either side; the apex much shorter, 

 not distinguished, ending bluntly with minute hardly distinguishable 

 papillate elevations about the pore. Spores about 18 X 3.5 /^. 

 Perithecia; stalk and basal cell region 54-62 X 18-23 /x; venter 

 55-65 X 38^5 m; neck 90-100 X 15 m; tip and apex 26-30 X 15 /x. 

 Appendage 55-62 ix. Receptacle 100-120 X 18 /x. Total length to tip 

 of perithecium 310-390 /x. 



On the superior surface of the abdomen of Sapromyza sp. Nos. 

 2495 and 2494, Orizaba, Mexico (Mann). 



This species is perhaps more nearly allied to S. Scaptomyzac but is 

 clearly distinguished by its inflated venter and other details of struc- 

 ture. 



Oil Trypetidae. 



Stigmatomyces Ensinae nov. sp. 



Nearly hyaline to the basal cells of the perithecium, the rest dull 

 reddish amber-brown. Basal cell usually curved, tapering below, 

 often somewhat inflated distally, and becoming narrower below the 

 base of the subbasal cell ; which is distinctly and usually very abruptly 

 broader, stout, seldom more than twice as long as the basal cell, often 

 inflated in the mid-region, and slightly contracted above and especially 

 below. Stalk-cell of the appendage long and narrow, its attenuated 

 base reaching to the subbasal cell, its distal end hardly broader than 

 the basal cell of the appendage, from which it is separated by a slight 



