412 PROCEEDINGS OF THE AMERICAN ACADEMY. 



rather abruptly distinguished, deeper brown below, its tip inflated below 

 four terminal projections, three or two of which are in the form of rounded 

 papillae of unequal size, and one or two of which are pointed and much 

 more prominent. Spores 42 X 3.5 /x. Perithecium, including the stalk, 

 which is continuous with it, 125 X 20-35 jj.. Receptacle to base of pri- 

 mary appendage 50-75 fi. Secondary appendages about 75 /x. Total 

 length to ti23 of perithecium 150-180 /x. 



Densely crowded on the inferior surface of the abdomen or rarely on 

 the legs of a small pale fly, remarkable for a prominent black spur-like 

 bristle on the posterior legs. Ralum, New Pomerania. Berlin Museum, 

 No. 1282. 



Dimeromyces rhizophorus nov. sp. 



Male Individual. Receptacle consisting of a basal cell which penetrates 

 the host directly without a diiferentiated foot, and two to three super- 

 posed cells above it, each of which usually bears an antheridium, the 

 upper terminated by a short, pointed, slender cell. The antheridia 

 rather short and stout, with short, stout necks. Receptacle about 50 X 

 8 fi. Appendage 12 X 3.5 /x. Antheridia 25 X 9 yu. 



Female Individual. More or less deeply tinged with amber brown. 

 Receptacle amber brown, consisting of six superposed cells, the small 

 basal cell, hardly visible above the integument, penetrates the host 

 directly by means of a very large, abruptly furcate rhizoid, the two cells 

 above it similar, broader than long, bearing each an appendage consist- 

 ing of a basal cell bent toward the receptacle, darker and narrower 

 distally, and separated by a dark septum from the three-celled terminal 

 portion, which is straight or slightly curved, larger toward the middle, the 

 smaller terminal cell becoming partly disorganized. The next (fourth) 

 cell of the receptacle bears the single perithecium ; the distal terminal 

 cell longer and narrower, and terminated by a shoi't, pointed, one- some- 

 times two-celled primary appendage (similar to that of the male in- 

 dividual), from which it is separated by a constriction ; the subterminal 

 cell narrower distally, producing on its inner side an appendage similar 

 to those below it, but straight and somewhat shorter. Perithecium with 

 a short stout stalk rapidly expanding into the asymmetrically inflated 

 deeper brown venter of the perithecium ; the neck very short and 

 abruptly distinguished ; the tip relatively large, four-lobed, inflated with 

 two lateral papillate outgrowths, above which the lips form a subconical 

 projection. 



Spores about 25 X 3 ^. Perithecium including stalk 70-90 X 20- 



