360 



MONOGRAPH OF THE LABOULBENIACE^. 



The perithecium is but slightly flattened, its cell-rows composed of four cells, and contains 

 four ascogenic cells at maturity. The trichogyne, which has been observed in a few instances, is 

 rather short and sparingly branched and septate (Plate II, fig. 6). The sterile appendages are 

 very characteristic in appearance, being invariably simple, usually quite opaque, except along 

 their upper margin, and more or less distinctly septate. 



The species occur on beetles belonging to the Carabidae and Staphylinidae, two of them on 

 ca/e beetles, and are found in Europe, Africa, and North America, including Mexico. 



Rhachomyces lasiophorus Thaxter. Plate II, fig. 6; Plate XII, figs. 7-11 and 17-19. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 467 ; Acanthomyces lasiophorus Thaxter 1. c. Vol. XXVII, p. 37. 



More or less suffused with blackish brown. Perithecium sessile, becoming brown, somewhat 

 inflated, nearly symmetrical, tapering to a rather blunt apex. Appendages arranged in two rows 

 of larger bristle-like members, hyaline-tipped, blackish below, running from the sub-basal cell to 

 the apex of the receptacle, where they surround the base of the perithecium, which exceeds them 

 by about half or one-third its length : from the cells of the receptacle between these two rows arise 

 smaller appendages, which become more numerous towards its extremity. Receptacle slender 

 at the base, expanding upw r ard, consisting of a main axis of about twelve superposed vertebra- 

 like cells, at first hyaline, becoming blackish, and of a scries of smaller cells almost completely 

 concealed by the appendages. Spores, 30 x 3 /x. Pcrithccia, 140-145 x 50 fi. Larger append- 

 ages, 75-90 ^. Receptacle, 175 /x. 



On Atranus pubescens Dej. New Hartford, Connecticut; Stony Brook, Mass.; Virginia. On 

 Badister micans Lee, Acupalpus earns Lee, and gen. indet., Kittery Point, Maine. 



A few specimens of a species apparently identical with this were found on a small species 

 of Platynus captured in swampy woods at Kittery, but these as well as the host have been 

 unluckily lost. The usual host of the species is quite rare, and I have found but four specimens, 

 two of which were infested. The Virginia specimens were collected near Washington by Mr. 

 Pergande. The compact form, brown inflated perithecium, short, stout, and closely appressed 

 appendages serve to distinguish the species from its allies. 



Within the past year further material of this form has been collected at Kittery on the 

 two additional hosts above mentioned, from which it is apparent that the species is subject to 

 considerable variations in size and form. Figures 17-19 of Plate XII were drawn from this 

 material, and fig. 17 represents the greatest divergence from the type observed in any of the 

 mature individuals. 



Rhachomyces speluncalis Thaxter. Plate XI, figs. 23-25. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 468. 



Perithecium more or less deeply suffused with brown ; short and stout, with a broad, bluntly 

 rounded apex. Receptacle slender, the main axis constricted strongly at the septa, its cells 

 rather small, the basal slender and cylindrical ; the remainder, about nine in number, all evenly 

 and rather deeply suffused with brown, and more or less uniform in size. Appendages mostly 



