686 THAXTER. 



colorous with the venter and basal cell region of the perithecium; 

 relatively short and stout, its base rather broad and hardly oblique, 

 its outer margin straight, its distal margin but slightly broader than 

 the very broad insertion of the relatively large appendage. Append- 

 age becoming more deeply suffused with a faint smoky brown tinge, 

 its axis consisting of five short cells of about equal length, except the 

 fifth which is somewhat smaller; bearing ten rather crowded antheri- 

 dia, their large prominent, nearly straight necks directed obliquely 

 outward, one terminal without visible spine, often reaching to the 

 distal end of the venter, one from the fifth axis-cell and two from each 

 of the others. Stalk-cell of the perithecium longer than broad, pale, 

 subtriangular, its outer and upper inner angles broadly rounded; 

 somewhat larger than the secondary stalk-cell, which is similar in 

 form; the basal cells relatively large, the outer distally prominent 

 beyond the base of the venter, its outer margin somewhat concave. 

 Venter straight, rarelj^ slightly inflated, the margins usually straight 

 and diverging slightly, the distal end which is faintly striate or punc- 

 tate, thus distinctly broader than the base, and marked b}^ four 

 conspicuous flat rounded elevations, variably prominent and corre- 

 sponding to the four wall-cells : the slightly spreading base of the very 

 stout neck thus abruptly distinguished, about equal to the venter 

 in length, distally slightly enlarged, more distinctly so externally, 

 so that the very slightly narrower tip and apex are more or less clearly 

 distinguished from it: the hyaline and distally somewhat oblique apex 

 not at all distinguished; the tip very slightly inflated distally, so that 

 its lower margin is somewhat concave, especially externally; the 

 rounded outer lips broader and more prominent than the inner. 

 Spores 30 X 3 ju. Perithecia 130-160 /z, largest 192 ^ : venter 55-64 X 

 28-32 n at base X 35-42 fj. at apex. Appendage 52-60 X 18 ii. Re- 

 ceptacle 90-140 M, the longest 160 m- Total length 250-300 m, the 

 longest 400 ju. 



On the legs and abdomen of a species of Discocerina, No. 1464, 

 vicinity of Concepcion, Chile, Nov. 1905. 



Although the conformation at the tip of the perithecium in this 

 species suggests that of the less well marked forms of *S. Discocerinae, 

 and its venter is not unlike that of S. Caribbeus, both of which occur 

 on flies of the same genus, it is very clearly distinguished from either 

 by its large coarse five-celled appendage. iVbundant material has 

 been examined, the individuals showing little variation except in 

 size. 



