THAXTER. — ARGENTINE LABOULBENIALES. 215 



40-45 n, its longer appendage ()0-2()0 jjl, tlie shorter 70-78 jjl. Ap- 

 pendage 135 ;u. Receptacle 80X35^1. Total length to tip of peri- 

 theeiuni 175-190//; to tip ol" inner appendage 310 370 //. 



On the inferior surface of the ahdomen of licwsus sp. or a closely 

 allied genus. Palermo near Belgrano, No. 1944. 



A species readily distinguished by its paired perithecial appendages, 

 but conforming strictly to the type so clearly marked in this genus. 



Ceratomyces rhizophorus nov. sp. 



Receptacle small, hyaline, normal; the second and third cells 

 broad and much flattened. The appendage long, of nearly eciual 

 diameter throughout, composed of numerous short flattened cells 

 bearing scattered branches. The basal cell, and one or more of the 

 upper cells of the receptacle, developing short rigid curved simple 

 outgrowths, which grow downward to the substratum. Perithecium 

 stout, tapering distally to a well distinguished, abruptly narrower, 

 bluntly rounded tip; each marginal row of wall-cells comprising about 

 twenty cells. Perithecium 100X40 //. Appendage 135X10 m (broken). 

 Receptacle 50 ii, the foot 20 ^. Total length to tip of perithecium 

 150//. 



At the tip of the left anterior leg of Tropisternus sp. Palermo, near 

 Belgrano, No. 1645. 



All but two specimens of this small and peculiar species were unfor- 

 tunately destroyed by accident, while they were being mounted, so 

 that it has been necessary to base the above description on a single 

 nearly mature, and one younger individual. It is, however, so pecu- 

 liar, and so well characterized by its supporting outgrowths that it 

 has seemed safe to give it a name. The outgrowths are evidently 

 buffers, similar in function to those described in Edeinomyces 

 {Hydrophilomyces) digitatus Picard, and of Sccluphoroinyccs described 

 above. 



Ceratomyces ventriosus nov. sp. 



Receptacle relatively long, the subbasal cell and the cell above it 

 deeply blackened laterally, the suffusion extending upward and involv- 

 ing the outer margin or half of the cell which subtends the appendage. 

 Appendage long and relatively slender, bearing a few scattered 

 branches, the lower cells somewhat flattened and becoming divided 

 by a few oblique septa. The receptacle, appendage and base of 

 perithecium pale yellowish, or with a reddish-amber tinge. Peri- 



