198 PROCEEDINGS OP THE AMERICAN ACADEMY. 



topped snout-like tip slightly upcurved. Receptacle short and stout, 

 the basal cell small, short, hyaline, contrasting, the rest concolorous 

 with the perithecium, but darker and distinctly punctate with dark 

 brown spots. Outer appendage consisting of a series of from three to 

 about six successively smaller superposed cells, from each of which 

 a simple tapering browQ branch arises, blackened about its subbasal 

 septum, the successive branches superposed in a vertical external row 

 as in L. Pacliytelis, the basal cell of the inner appendage producing 

 usually a short one-celled antheridial branch. Perithecia 120 X 45 ^u. 

 Total length to tip of perithecium 200-220 /;x; to insertion-cell 125 /a. 

 Appendages 100-120 /x,. 



On Pacliyteles parallelus, Chaud., Brit. Mus. No. 575, Para: on P. por- 

 rectus Chaud., Brit. Mus. No. 670 (Biologia Coll.), Pantaleon, Guate- 

 mala. On legs. 



Laboulbenia pygmeea nov. sp. 



Perithecium dark brown becoming almost opaque, coarsely punctate 

 throughout or only toward the base, the basal wall-cells forming a well 

 defined hyaline contrasting short neck slightly narrower than the body 

 of the perithecium, the tip usually not very abruptly distinguished and 

 bent very slightly outward, or straight, rather blunt, the lip-edges trans- 

 lucent, the lip-cells blackened below, especially on the inner side. 

 Receptacle very short and subtriangular, cell I short, slender, curved, 

 hyaline at the base, distally becoming opaque blackish and indistinguish- 

 able from cell II, which is wholly opaque. Cells III and IV elongated 

 and lying obliquely side by side, cell III forming a more or less prominent 

 rounded projection a little below the insertion-cell, both cells becoming 

 opaque ; cell V rather large, at first hyaline, becoming later suffused 

 with brown ; all the other suffused parts rather coarsely punctate. In- 

 sertion-cell black, very broad, often becoming indistinguishable from the 

 basal cells of the appendage. Outer appendage consisting of a sub- 

 triangular basal cell distally rounded, becoming deeply suffused with 

 blackish brown, prominent externally ; surmounted by a series of 

 obliquely superposed cells close set, their long (transverse) axes some- 

 times almost perpendicular, each bearing externally a single simple 

 branch, the two lower cells of which are longer than broad, tinged with 

 brown, the septa dark and often oblique ; the distal portion hyaline, twice 

 as long, blunt-tipped: the inner appendage consisting of a smaller basal 

 cell also becoming almost entirely suffused, surmounted on either side by 

 a series of cells like that of the outer appendage and similarly branched, 



