THAXTER. — LABOULBENIACE^E. 469 



cells above described ; but the exact structure in this region, behind 

 the stalk cells of the perithecia, has not been made out satisfactorily. 

 An obliquity in the septum which separates the basal and sub-basal 

 cells sometimes results in the apparent absence of any sub-basal cell. 



DiPLOMYCES ACTOBIANUS, nov. Sp. 



More or less faintly tinged with brownish. Basal cell of receptacle 

 triangular, sub-basal cell flattened or wedge-shaped ; the posterior 

 prominences peculiar to the genus nearly as long as the receptacle 

 itself, slightly divergent, two-celled, the terminal cell twice as long as^ 

 the basal, tapering slightly towards its rounded extremity. On the 

 anterior side the two perithecigerous cells bear the first pair of peri- 

 thecia on short stalk-cells bent abruptly upwards, divergent, and suc- 

 ceeded by three small cells forming the base of the peritheciunu The 

 perithecia rather slender, curved towards the receptacle so that their 

 tips project beyond it, divergent, rather long and slender, tapering 

 slightly, the apex blunt with ill defined lips, the base of the old 

 trichogyne persisting conspicuously below the pore. Appendages 

 branching, arranged in pairs symmetrically like the perithecia ; a 

 smaller one arising just behind the stalk cell of the perithecium, a 

 much larger one above this followed by a few smaller ones less defi- 

 nitely arranged in the region whence a second pair of perithecia may 

 arise. All the appendages more or less copiously branched, the 

 branchlets terminating in many cases by the slender, curved and 

 sharply pointed cells characteristic of Teratomyces. Spores 32 X 2 /x. 

 Perithecia, including stalks, about 75 X 12 |x. Receptacle to tips of 

 prominences 75 /x. Total length to tip of perithecia 110 /x. Greatest 

 width 37 fx. 



On Actobius nanus Horn. Massachusetts. 



This species occurs rather rarely on the abdomen of a large brown 

 variety of Actobius nanus, but not as far as has been observed on the 

 normal form. A second form, perhaps distinct from the present, was 

 found on the abdomen of a small Philonthus, and is distinguished by 

 the presence of slender thread-like branches from the larger appen- 

 dages. Sufficient material of tbis form was not, however, obtained, 

 and it may prove to be nothing more than a variety of the one above 

 described. 



Sphaleromyces occidentalis, nov, sp. 



More or less evenly tinged with brownish. Perithecium large, sub- 

 fusiform, with faintly defined ridges at the divisions between- the wall 



