170 PROCEEDINGS OF THE AJVIERICAN ACADEMY. 



Although its host was very common in the Buenos Aires region, 

 this species was seldom met with. It is the largest species of the 

 genus thus far described, but is otherwise without striking peculiari- 

 ties. 



Dioicomyces malleolaris nov. sp. 



Male individual, consisting of three superposed cells and a terminal 

 antheridium, relatively small and stout; the basal cell nearly hyaline, 

 twice as long as broad, the subbasal cell but slightly longer than 

 broad, the third cell much shorter than broad; the antheridium 

 relatively large, slightly suffused, distally somewhat asymmetrical, 

 the well developed neck terminal at the side. Length about 45 X 



7.5 yu. 



Female individual, hammer-shaped: the basal cell of the receptacle 

 very small, suffused with blackish brown; the subbasal minute, flat; 

 the appendage-cell blunt-conical, faintly yellowish. Perithecium 

 horizontal, its upper outline straight; the axis of its main body lying 

 at right angles to that of the long, very thick-walled, slightly curved 

 stalk-cell, the lumen of which may be nearly obliterated; the position 

 of the basal cells and basal wall-cells so abnormal that the rounded 

 ascigerous region projects free on one side corresponding to the free 

 tip which projects somewhat further on the other; the whole supported 

 by two cell-series that diverge abruptly from the end of the stalk-cell ; 

 on one side, as seen laterally, consisting of two basal cells, on the other 

 of one basal and two squarish wall-cells; the whole including the 

 stalk-cell more or less suffused with pale smoky ^^ellowisli brown; 

 the tip tapering slightly to a blunt slightly asymmetrical apex. Spores 

 28-30X3.5 M- Perithecia 99-100X26-32 /x. Stalk-cell 65-90X16m. 

 Appendage cell 15-16 fx. Receptacle including large foot 28 /x. 



On the tip of usually the right elytron of Anthicus parvus Pic, 

 Palermo and Llavallol, No. 1513. 



This very curious and rather rare species grows more or less ap- 

 pressed, the perithecium lying at right angles to the axis of the elytron. 

 Like all the species of the genus herewith described, the spores begin 

 to germinate normally before discharge and are twice septate when 

 they emerge, with a well developed black foot. 



Dioicomyces umbonatus nov. sp. 



Male individual almost hyaline or faintly yellowish brown externally, 

 rather slender, straight or slightly curved inward, the basal cell as 



