OF ARTS AND SCIENCES. 185 



On leg of Philonthus debilis Grav., Massachusetts. 



This well marked species is easily separated from the two previously 

 described by its blackish suffusions and the arrangement of its appen- 

 dages. It is smaller even than P. minimus, and bears a superficial 

 resemblance to Dichomyces furdferus. 



Heimatomyces borealis, now sp. 



Hyaline or slightly yellowish. Perithecium large and stout, its dis- 

 tal half or more free from the receptacle, tapering slightly to the large 

 blunt apex. Sub-basal cell of the receptacle small and flattened : the 

 distal portion of the receptacle composed of only three cells (the fourth 

 obsolete or very minute), the distal one large, longer than broad, its 

 base very oblique, the two others very long and subtriangular, the 

 septum between them running obliquely from the insertion of the 

 "trichogyne " nearly to the base of the inner cell. Perithecia 80-90 

 X 22 /x. Receptacle, total length 75-80 p ; length to tip of perithe- 

 cium 110-1 20 p. 



On legs of a minute water beetle, Kittery, Maine. 



This species differs from those previously described by the absence 

 of the fourth cell in the distal portion of the receptacle. It is related 

 to the succeeding species in its cell arrangement, but is easily sepa- 

 rated by its greater size, the relative position and shape of the peri- 

 thecia, etc. The ascogenic area is also external, a position which 

 seems exceptional. 



Heimatomyces Bidessarius, nov. sp. 



Hyaline becoming faintly tinged with blackish. Perithecium small, 

 its upper third or fifth free from the receptacle, the apex bent out- 

 wards, the basal portion straight, the tip broad with large prominent 

 lips. Receptacle stout, the two basal cells more nearly equal, the two 

 cells above these longer than broad and nearly equal ; distal portion 

 nearly as in H. borealis, the base of the short terminal cell horizontal. 

 Perithecia 40-48 X 15 p. Receptacle 65 /x long. Total length to 

 tip of perithecium 80 p. 



On elytra of Bidessus granarius Aube, Kittery, Maine. 



CERATOMYCES, Thaxter. 



The six additional species of this genus, five of which are described 

 below, represent a peculiar and well marked type. The two Bpeciea 



