682 THAXTER. 



Plate XLVI, fig. 24). The variety is smaller than the type, the 

 average length in well developed individuals being about 180 fx, the 

 maximum hardly more than 200 fj.. Abundant material has been 

 examined from the following sources, in all cases from species of Atissa. 

 Nos. 1737 (Type), 1717 and 1738, Mandeville; No. 1917B, Battersea, 

 and No. 2042 from Clarkstown, Jamaica, W. I. Nos. 2803-2804, 

 St. George, Grenada : these numbers representing numerous individual 

 hosts. 



Stiff matomyces Psilopae nov. sp. 



Variably elongate, sometimes rather short and stout, wholly suf- 

 fused with brownish yellow or amber-brown, except the hyaline 

 receptacle. Receptacle straight or slightly curved, but slightly 

 broader distally, the two cells usually of about ec^ual length. Stalk- 

 cell of the appendage relatively short and broad, its base hardly 

 overlapping the subbasal cell, distally prominently rounded outward 

 below the insertion. Appendage rather stout and compact, the axis 

 consisting of four cells and bearing eight antheridia, their short slightly 

 curved stout necks directed outward, or slightly sidewise; the termi- 

 nal one bearing a conspicuous spine on its inner side at the base of its 

 neck; the fourth cell of the axis bearing a single antheridium; the 

 three lower each two ; the basal cell somewhat larger than the others, 

 narrower below. Cells of the stalk- and basal cell region more or less 

 uniform in size, the outer somewhat prominent: venter of the peri- 

 thecium becoming normally verrucose, the verrucosities irregularly 

 disposed, or more or less distinctly transverse, rarely inconspicuous; 

 oval or elliptical in outline, sometimes tapering more distinctly distally, 

 rather abruptly distinguished from the abruptly spreading base of the 

 usually elongate and slender neck; which is typically verruculose, 

 but may be smooth, or only somewhat roughened, of about the same 

 diameter throughout, or tapering slightly distally; its junction with 

 the tip occupied by an abrupt and conspicuous inflation, which is 

 nearly symmetrical on either side: the apex distally very slightly 

 oblique and bearing a crown of four clearly defined somewhat divergent 

 blunt prominences, a fifth, somewhat broader and slightly more 

 prominent, lying between the two outer ones. Spores 35 X 3.5 /it. 

 Perithecia: venter 85 X 42-62 m; neck 70-140 X 18 m; tip 28-32 m- 

 Receptacle 78 m to very rarely 260 X 20-25 /x. Appendage 52 X 14 n. 

 Total length to tip of perithecium 300-435 fx, the longest 540 fi. 



On species of Psilopa. No. 1853 (Type) No. 1867, Balaclava; 



