1914. 



NATURAL SCIENCES OF PHILADELPHIA. 



237 



Leporinus paralternus sp. nov. Fig. 4. 



Head 3|: depth 4|; D. in, 10, i; A, in, 8; P. i, 16; V. i, 8; scales 

 36 in lateral line to caudal base, and 3 more on latter ; 6 scales above 

 1. 1.; 5 scales below 1. 1. to ventral origin; 5 scales below 1. 1. to anal 

 origin; 13 predorsal scales; head width 2 in its length; head depth 

 at occiput If; snout 2|; eye 4^; maxillary 4; interorbital 3; first 

 branched dorsal ray U; first branched anal ray If; upper caudal 

 lobe 1; least depth of caudal peduncle 2|; pectoral 1|; ventral 1|. 



Body moderately long and slender, compressed, deepest at dorsal 

 origin, and edges all convexly rounded. Caudal peduncle well 

 compressed, about long as deep. 



Head rather conic, compressed, sides flattened slightly though 

 about evenly curving over above and below. Snout elongate, conic, 



Fig. 4. — Leporinus paralternus Fowler. (Type.) 



long as broad. Eye rounded, a little high, centre about midway 

 in head. Adipose-eyelid very slight. Mouth small, nearly terminal, 

 or but slightly. inferior, so that upper jaw only protrudes very little. 

 Maxillary moderately inclined, small, extends a little beyond anterior 

 nostril, though not to posterior. Lips thick, fleshy, entire. Eight 

 teeth in each jaw% graduated forward to median which are longest, 

 and all ending in a point on cutting-edge. Inner buccal membrane 

 above quite broad. Tongue little distinct. Mandible shallow in 

 front, short rami well elevated in mouth. Anterior nostril lateral, 

 in small cutaneous tube reaching back nearly to' posterior, which 

 latter simple and about last | in snout length, also lateral. Inter- 

 orbital evenlv convex. Suborbitals of moderate width. Preopercle 



