362 



MONOGRAPH OF THE LABOULBENIACEiE. 



One mature and several immature specimens of this fine species were found on the elytra of 

 a specimen of its host in the collection of the Cambridge Museum. It is at once distinguished 

 by its sigmoid outline, colorless receptacle, and appressed, incurved, short appendages, as well as 

 by the unusual development of its appendiculate cells. 



Rhachomyces arbusculus nov. sp. Plate IV, figs. 6-7. 



Perithecium pale straw-colored, long and slender, tapering slightly and gradually towards 

 the bluntly rounded apex, which is suffused with brown ; the stalk-cell short, for the most part 

 hidden by the appendages. Receptacle slender, curved or slightly sigmoid ; the cells of the main 

 axis, about twenty to twenty-five in number, more or less deeply suffused with blackish brown ; 

 the septa rather oblique ; the apex distinct beyond the insertion of the stalk-cell of the perithe- 

 cium. Appendages numerous, externally black and opaque, the inner margin more or less 

 transparent, stiff, short, their tips more or less prominently and abruptly recurved, arising from 

 all except the basal cell of the receptacle, and projecting obliquely upward ; those at the base 

 of the perithecium somewhat longer and more prominently curved away from its base on either 

 side. Perithecium, 170-190 x 35-38 Spores about 50 /x long (measured in the perithecium). 

 Receptacle, 200-325 /a long. Appendages, 85-100 



On an undetermined staphylinid allied to Lathrobium, Mt. Coffee, Liberia, Africa (O. F. 

 Cook). 



This species corresponds in all respects to the type so closely adhered to in all the other 

 species of this genus, from which it may be readily distinguished by its long slender form and 

 very numerous short recurved appendages. The types, which are in excellent condition, were 

 found on the abdomen of the host, a small riparian staphylinid. 



Rhachomyces furcatus Thaxter. Plate XII, figs. 1-3. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 467; Acanthomyces furcatus Thaxter 1. c. Vol. XXVIII, p. 177. 



Perithecium more or less suffused with brownish, straight, slightly inflated at the base, 

 tapering gradually to the apex, borne on a stout, and well marked stalk-cell. Receptacle more 

 or less tinged with brownish, its main axis consisting of about twelve superposed cells, continued 

 by a more slender prolongation beyond the base of the perithecium, this prolongation sometimes 

 forming a second successive main axis terminated by a second perithecium and continued by a 

 similar prolongation beyond the base of this second perithecium, which arises on the side of 

 the general axis nearly opposite to that which bears the first. Appendages dark brown, opaque, 

 stout, rigid, nearly straight or slightly curved outward, the longest not equalling the tip of the 

 perithecium. Spores, 48 X 4 fi. Perithecia, 160-185 x 48-55 \i. Appendages (longest) about 

 150 ix. Total length to tip of receptacle about 360 yu. Main body of receptacle about 220 fi long. 

 Total length when two perithecia present (longest), 550-600 //.. 



On Othius fulvipennis Fab., Germany. 



A number of specimens of this large and well-marked species were found on the abdomen 

 of a specimen of its host in the collection of the Museum at Cambridge. It is characterized by 



