OF ARTS AND SCIENCES. 173 



turn on the convex side, bearing a single short simple branch rather 

 closely septate, hyaline, blackened and constricted at the base, di- 

 rected obliquely upwards. The inner appendage similar, except that a 

 cell is present opposite the first septum at the base on the inner side, 

 which bears a single autheridium or a very short fertile branch. 

 Receptacle expanded above cell (2), cells (1) to (G) hyaline, the rest 

 blackish brown : cell (5) greatly enlarged so as to throw the append- 

 ages outwards, separating them by nearly its whole width from the 

 perithecium, its free upper surface forming a right angle with the 

 straight inner margin of the perithecium; cells (1) and (2) rather 

 slender. Perithecia 130-150 X 65 jx. Appendages 150-lGO^t, the 

 branches (longer) 75-100 u.. Length to tip of perithecium 400 p. 

 Greatest width 110 /x. 



On the thorax of Brachinus sp., Texas. 



One of the most peculiar of all the species of Laboulbenia, the 

 appendages of which are approached only by L. Phcropsophi. 



Laboulbenia Pachytelis, nov. sp. 



Perithecium rather small, but slightly exceeding the receptacle, 

 suffused with dark olive-brown, becoming nearly opaque, tapering 

 abruptly to the rather slender blackened tip, which is bent slightly 

 outwards, the nearly hyaline lips outwardly oblique. Appendages 

 two; the outer forming a subcorneal body composed of superposed 

 flattened cells four to ten in number, each cell giving rise externally 

 to a single obliquely ascending, rather short, simple, stout, tapering 

 branch, blackened at its base, where a basal cell is cut off by a contrast- 

 ing black septum. The inner appendage consisting of a small basal 

 and sub-basal cell separated by a blackened septum, the upper giving 

 rise directly to from one to three antheridia or short sterile branches. 

 Receptacle short or elongate, nearly hyaline or becoming distally suf- 

 fused with blackish brown, normal, except for the unusual development 

 of cell (5), which extends along the inner margin of the perithecium 

 beyond the insertion of the appendages, pushing them outward free 

 from the perithecium. Spores GG X 7 p. Perithecia 1 10 -150 X 50 p. 

 Outer appendage, without branches, 90 p long, the branches (longest) 

 180 fj.. Total length to tip of perithecium 300-G50 M . 



On legs aud inferior surface of Pachyteles mextcanus Chaud., 

 Mexico. 



