178 PROCEEDINGS OF THE AMERICAN ACADEMY. 



paired antheridia, the terminal cell or cells of the series sterile, or 

 converted directly into antheridia. Perithecium usually solitary, 

 normal, with a well developed stalk-cell; the short trichogyne arising 

 from the base of the prominent free portion of the trichophoric cell. 



Were it not that sufficient material is available of two other species 

 of this genus which occur on allied staphylinids, one in Borneo and 

 the other in New England, I should hesitate to separate this type 

 from the very large and varied genus Siigmatomyces. The antheridia 

 recall those of Idiomyccs, in which I have described an arrangement 

 of antheridia in three vertical rows. I have not felt satisfied, however, 

 that this was the actual condition, and a reexamination of fresh 

 material of this curious type may show that here also the antheridia 

 are in two and not in three vertical rows. 



The Argentine material is for the most part in poor condition, only 

 one of the dozen or so specimens being fully matured. The perithecia 

 do not greatly resemble those of Stigmatomyces, having well developed 

 stalk-cells, while the distinction between venter, neck and tip is not 

 well marked. The apex, in all three species, is rather characteristi- 

 cally shaped, flat-conical, without projections or papillae. There 

 appear to be four ascogenic cells in all cases. 



Zeugandromyces australis nov. sp. 



Perithecium nearly symmetrical and straight, rather elongate, rich 

 amber-brown, paler distally; the base inflated, tapering thence 

 gradually to the blunt conical apex; the stalk-cell stout, broader 

 distally, faintly yellowish or hyaline, in the type bent abruptly near 

 the base. Receptacle subtriangular, nearly symmetrical, broader 

 distally where the septum is horizontal; subbasal cell somewhat 

 broader, much smaller, irregular. Appendage tinged with brown, 

 the terminal and basal cells darker, the stalk-cell subtriangular, 

 broader externally, the basal cell more or less clearly distinguished 

 from the five to seven cells above it, and like them bearing relatively 

 large antheridia with long appressed upcurved necks; the terminal cell 

 sterile, subtriangular, turned inward, externally spiniferous. Peri- 

 thecium 155X44 n; the stalk-cell 16X27 n (distally). x\ppendage, 

 including stalk-cell, 44-54 /jl. Antheridia about 20 /jl. Total length 

 to tip of appendage 90 //; to tip of perithecium 250 ijl. 



On Scopaeus laevis Sharp. No. 1695, Palermo. 



Found on a single specimen of the three hosts collected. 



