206 PROCEEDINGS OF THE AMERICAN ACADEMY. 



cells of the inner appendage more oblique]}- superposed, six or seven 

 in number, the three lower bearing antheridial branches consisting 

 of single basal cells terminated by single antheridia; the simple sterile 

 branches of the upper cells extending to about the middle of the peri- 

 thecium. Perithecium 250-275X52 /x exclusive of the stalk (58X30 /jl). 

 Receptacle 190-200X90 fx. Appendages to tips of branches about 

 175 m; the antheridia 24 /j., their basal cell 20 /i. Total length to tip 

 of perithecium average 500-510 /x. 



On the inferior surface of the abdomen of Galerita Lacordairii. 

 Museo Nacional, No. 1428, "Argentina." 



Laboulbenia sordida nov. sp. 



Resembling L. pcrplcxa; rather slender; the basal cell of the recep- 

 tacle hyaline, the rest becoming irregularly suffused with dirty olive 

 brown; the region below the insertion-cell becoming nearly opaque, 

 the subbasal cell sometimes lighter or hyaline distally; cell IV sepa- 

 rated from cell III and V by parallel septa at an angle of 45° to the 

 axis of the receptacle. Insertion-cell broad, thick, horizontal, opaque; 

 the opacity involving the outer basal cell of the appendage which is 

 externally prominent upward. The outer appendage consisting of a 

 series of seven or eight obliquely superposed cells, coherent through- 

 out with the inner appendage, short; all, including the basal cell, bear- 

 ing erect branches, the two basal cells of which are dark brown, the 

 rest of the branch nearly hyaline and extending to or slightly above 

 the middle of the perithecium: the inner appendage consisting of a 

 series of usually five cells on either side above the basal cell, the 

 distal one bearing a short erect branch, while the four lower bear 

 antheridial branches consisting of a well dcAeloped brown basal cell, 

 bearing distall}- a pair of divergent, brown, somewhat curved antheri- 

 dia. Stalk of the perithecium clearly' distinguished, about as long as 

 broad, hyaline, contrasting; the main body deep olive brown, straight, 

 asymmetrical, very slightly inflated below; the tip slightly darker, 

 short, asymmetrical, more or less well distinguished, its outer margin 

 oblique; the apex translucent, obliquely rounded outward, subtended 

 on the inner side by an opaque suffusion. Perithecium, exclusive of 

 stalk, 215-235X45-47 M, the stalk 27-31X27 m- Receptacle 215X 

 66 /x. Appendages, to tips of branches, longest, 160 /x. Antheridia 

 23-27X6 /x. 



On the tips of the elytra of a black Galerita, La Plata, No. 2021. 



This species is most nearly related to L. perplexa, from which it is 



