TIIAXTEH. — ARGEXTIXK LAnOULRKNIALES. 203 



short, al)riiptly distinguislied, laterally deeply sufl'iised especially 

 externally; the lips rounded, more or less symmetrically, translucent 

 or hyaline. Spores 45X3.5 m- Perithecia 98X35 /jl. Appendages 

 to tips of longest branches 155 ix. Receptacle 125-275 ix. Total 

 length to tip of perithccium average 250-275 fx (150-300 /x). 



On all parts of a species of Apcnes. Tucunian, No. 1940 

 (P. Spegazzini). 



This species of which abundant material is available, is somewhat 

 similar to L. Ooptcri, but differs in its characteristically and more 

 strongly curved perithecium, and in the absence of dark septa in the 

 outer appendage, the basal cell of which is never as highly developed, 

 in the present species. Individuals growing on the legs are smaller, 

 stouter and darker. 



Laboulbenia flexata nov. sp. 



Yellowish to hyaline, with variable brown shades; the perithecium 

 becoming uniformly rich translucent brown. Form rather slender, 

 evenly curved throughout, but more or less distinctly geniculate 

 between the ba^al and subbasal cells of the receptacle which are 

 rather long and about equal in dimensions. Cells IV anfl V somewhat 

 enlarged and divergent, carrying the very broad and thick black 

 insertion-cell free from the base of the perithecium. Appendage 

 consisting of an outer and an inner branch of the type of L. Texana; 

 the outer stout, or curved somewhat away from the inner, and con- 

 sisting of four to six large subequal cells, each bearing a simple branch- 

 let like those of L. Texana, subtended by a small cell from which it is 

 separated by a deeply blackened septum; the small terminal cell of 

 the series bearing two such branchlets: the inner appendage consisting 

 of two branches which spring from a common basal cell; one of them 

 unicellular and terminated by a single antheridium, the other strongly 

 curved across the perithecium, and consisting of five or six small 

 superposed cells, each bearing a simple branchlet similar to those of 

 the outer appendage. Perithecium rather narrow, curved toward 

 the appendage, its middle opposite the insertion-cell; its tip abruptly 

 distinguished, narrow, prominent, opaque, contrasting abruptly with 

 the hyaline symmetrically rounded apex. Perithecium 1 55-200 X 

 48-55 /i. Receptacle 275-390 /x. Outer appendage 135-155X40 n 

 at base, longest 200X50 ix: inner appendage 50-60X12 fx; longest 

 branchlets 120-140 ix. 



On the inferior left margin of the prothorax of Brachinus sp., No. 



