436 PROCEEDINGS OF THE AMERICAN ACADEMY. 



No. G98, Irazu, Costa Rica; on Gynandropus Mexicanus Putz., British 

 Museum (Biologia Coll.), No. 682, Cordova, Mexico. Usually on legs. 



Rhachomyces Thalpii nov. sp. 



Perithecium hyaline or straw colored, becoming faintly tinged with 

 brown, slender, inflated near the base ; the distal half or less mostly 

 curved away from the appendages, tapering gradually to the blunt 

 undifferentiated apex. Receptacle normally consisting of eleven cells 

 superposed to form the main axis, hyaline, their septa horizontal or but 

 slightly oblique, the basal cell subtriangular, tinged with reddish brown ; 

 the cells of the secondary series hyaline and proportionately rather large. 

 Appendages rather dense, almost opaque except the nearly or qnite 

 hyaline tip and inner margin ; rather short, about four to six of those 

 about the base of the perithecium much larger, longer, and stouter, reach- 

 ing somewhat higher than the middle of the perithecium, their tips at 

 first clavate becoming obliquely truncate or fan shaped through the 

 degeneration of the hyaline portion, the curved tips of the antheridia 

 projecting rather conspicuously. Perithecia 115 X 30 /a. Total length 

 of receptacle 140/x,. Longer appendages 90^. 



On Thalpius riifulus Lee, Amer. Mus. of Nat. History. Texas. 



Rhachomyces Zuphii nov. sp. 



Perithecium relatively small, straw colored, somewhat inflated at the 

 base, the tip rather abruptly distinguished and slightly inflated. Axis 

 of the receptacle slender, consisting normally of about sixteen cells which 

 are nearly hyaline, or with brown shades below the septa. Appendages 

 nearly opaque, straight stout appressed, not elongate, more or less 

 swollen distally along the inner margin of the subhyaline tip ; eight to 

 ten about the base of the perithecium longer and stouter. Perithecia 

 110-140 X 25 /x. Longer appendages about 110-140 /x. Total length 

 to tip of perithecium 350-400 /x. 



On Zuphkim Mexicanum Chaud., British Museum (Biologia Coll.), 

 No. 713. Cordova, Mexico. 



Rhachomyces Canariensis nov. sp. 



Perithecium pale straw colored, nearly straight, a median and subter- 

 minal well-defined broadly-rounded ridge marking the transverse septa 

 between the three lower tiers of wall-cells ; the tip tapering rather 

 abruptly, hyaline, the apex rounded. Receptacle rather slender, the 



