THAXTER. — LABOULBENIALES PARASITIC ON CHRYSOMELIDAE. 21 



in very good condition, there being no perfect individuals. It is well 

 distinguished by its enormous perithecia and by the development of 

 secondary branches from the basal cells of the secondary appendages. 

 It seems to be more nearly related to D. Homophoetae than to any 

 other species, the conformation of the apex of the perithecium being 

 somewhat similar, as well as the long-stalked antheridia, but it is 

 otherwise very distinct. 



Dimeromyces Hermaeophagae nov. sp. 



Male individual: nearly hyaline. Receptacle consisting of two 

 superposed cells, the basal larger, laterally related to the foot; the 

 subbasal giving rise to the single slender antheridium, the stalk-cell 

 and basal cells of which form a relatively long stalk below the narrow 

 only slightly enlarged venter, which is about as long as the rather 

 stout outcurved neck. Primary appendage consisting of a basal cell 

 nearly as long as the subbasal cell of the receptacle and bearing 

 terminally a two-celled slightly inflated portion of about the same 

 length, from which it is separated by a clearly defined dark septum. 

 Total length to tip of appendage, 35 n; to tip of antheridium 50 ju. 

 Antheridium-stalk (stalk- and basal cells) 16 fx; venter and neck 18 n; 

 appendage 17 ft. 



Female individual: nearly hyaline or faintly yellowish. Perithe- 

 cium arising from the third cell of the receptacle, its stalk-cell 

 small, hardly distinguishable, its form rather elongate, tapering 

 slightly, the tip distinguished by a very slight elevation; the spreading 

 funnel-shaped apex distinguished by a constriction. Receptacle 

 four-celled, the basal slightly larger, with inferior lateral small foot; 

 the second and fourth bearing secondary appendages the basal cells 

 of which are rather stout and long, and distinguished from the taper- 

 ing several-celled terminal portion by a distinct dark septum which 

 does not reach as far as the tip of the perithecium. Primary append- 

 age like that of the male, stouter. - Perithecium, exclusive of stalk- 

 cell, 60-70 /x. Secondary appendages 60-70 At. Primary appendage 

 20-25 fx. Total length to tip of perithecium 75-90 p. 



On antennae of Hermaeophaga insularis Jac, No. 2066, Grenada, 

 B. W. I. (Brues). 



This species seems most nearly allied to D. rninutissimus and differs 

 from all other known species in the peculiar funnel-shaped apex of the 

 perithecium. 



