28 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Dichomyces Australiensis nov. sp. 



Receptacle usually rather loug and narrow, the basal cell relatively 

 large, hyaline or slightly suffused; the margins of the lower tier usually 

 continuous with those of the middle one, the marginal cells deep blackish 

 brown or quite opaque, the middle cell hyaline or translucent throughout, 

 its lower third often punctate : the middle tier consisting of about nine 

 cells, slightly suffused with pale reddish brown externally, more or less 

 edged with deep blackish brown; the terminal cells forming a free 

 rounded projection on either side, extending as high as about the middle 

 of the rather large antheridia, the tips of which may reach to the bases 

 of the perithecia : the upper tier nearly hyaline, consisting normally of 

 from eleven to thirteen subequal cells, the terminal ones extending but 

 slightly higher than the bases of the perithecia, which are normally two 

 in number, rather deeply suffused with purplish brown throughout ; the 

 apex hyaline, the posterior lip-cells producing each a relatively large 

 bluntly pointed appendage, the two diverging nearly at right angles to 

 the axis of the perithecium, becoming slightly recurved, the distance from 

 tip to tip about twice the diameter of the perithecium. Appendages 

 nearly as long as the perithecia. Perithecium 60-70 X 16-20/*, its 

 appendages 18/*. Receptacle 90-100 X 42-48/*. Total length to tip 

 of perithecium 160-170 /*. 



On the superior surface of the abdomen of Quedius riificollis Grav. 

 Sharp Collection, No. 1102. 



Dichomyces Mexicanus nov. sp. 

 General habit much like that of D. prhiceps, generally rather long and 

 slender. Basal cell hyaline, the lower tier relatively long and narrow, 

 broadly edged externally with black ; the median cell hyaline, or only the 

 marginal cells slightly suffused with smoky brown : the middle tier dis- 

 tinguished from the lower by a slight prominence, hyaline, seven to nine 

 celled; the marginal cells protruding but slightly on either side; the 

 antheridia brownish, short, stout, blunt pointed : the upper tier relatively 

 very long, sometimes twice as long as the middle tier, consisting of from 

 nine to eleven cells ; the marginal cells protruding but slightly on either 

 side, very much as in the middle tier. Perithecia normally two, about 

 as long as the distal tier and concolorous with it, or somewhat darker, 

 rather stout, tapering but slightly; the tip rather abruptly distinguished, 

 broadly truncate with a slight median projection ; the posterior lip-cells 

 giving rise each to a long horizontal appendage, which becomes recurved, 



