20 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Dimeromyces Aulacophorae nov. sp. 



Male individual: hyaline with purplish brown shades. Receptacle 

 consisting of three to four very obliquely superposed cells terminated 

 by a simple appendage, the basal cell of which is long and slightly 

 inflated, bearing distally a three or four-celled terminal portion from 

 which it is separated by a rather deep constriction associated with a 

 conspicuous blackened septum. Antheridial branches one to three 

 in number arising unilaterally, one from each cell of the receptacle; 

 the stalk cell narrower below, suffused, rather long; the antheridium 

 hyaline, its basal cells rather large and long; the body rather narrow, 

 not symmetrically related to the rather broad long nearly isodiametric 

 neck, the apex of which is nearly truncate. Receptacle 32 X 10 /x 

 exclusive of foot; basal cell of appendage 16 X 6 ix, the distal part 

 30-40 X 4 p. Antheridium including stalk 30-40 X 5-6 /x, the stalk 

 sometimes 11 ix long. 



Female individual: purplish or amber-brown. Receptacle consist- 

 ing of usually six or seven obliquely superposed cells; flattened, ex- 

 cept the terminal one which is separated from the basal cell of the 

 terminal appendage by a horizontal septum; the subterminal cell 

 producing the solitary perithecium; all the rest, except usually the 

 small basal cell, giving rise to appendages which form a unilateral 

 series: basal cells of the lateral appendages short, somewhat inflated 

 and curved upward, bearing one to rarely four simple hyaline or 

 slightly suffused straight or flexuous elongate branchlets, which for 

 the most part taper but slightly and are distinguished at the base by a 

 conspicuous broad blackened septum and constriction: the terminal 

 appendage similar to that of the male, except that its basal cell often 

 bears two branchlets distally. Perithecium relatively very large, 

 hyaline or yellowish below, distally more or less suffused with purplish 

 brown, straight or less often curved, slightly broader just above the 

 short hardly distinguishable stalk, distally tapering rather rapidly 

 to the rather broad apex which, in anterior view, is symmetrically 

 three lobed, the middle lobe prominent and broader. Perithecium 

 when well developed 175-250 X 24-28 fx, sometimes smaller (100 X 

 18 n). Spores 32 X 3 /x. Receptacle about 65 X 20 /x. Basal cell 

 of primary appendage 20 X 6 .5 fx. Longer appendages 130 X 3.5 fx. 



On the elytra of Aulacophora postica Chap., Perak, Straits Settle- 

 ments. M. C. Z., No. 2510. 



The material of this species, although sufficiently abundant, is not 



