1913. 



NATURAL SCIENCES OF PHILADELPHIA. 



523 



NANNOSTOMIX.E. 

 Nannostomus stigmasemion sp. nov. Fig. 4. 



Head 3|; depth 3^; D. ii, 9; A. ii, 8; P. i, 10?; V. i, 7?; scales 

 20 in median lateral series from shoulder to caudal base; 6 scales 

 transversely between dorsal and ventral origins; 14 predorsal 

 scales; head width about If its length; head depth at occiput If; 

 depressed dorsal fin 1|; depressed anal fin If; least depth of caudal 

 peduncle 2f; caudal fin lyV; pectoral 1|; ventral If; snout 4j in 

 head measured from upper jaw tip; eye 2|; mouth width about 8; 

 interorbital about 2f . 



Body moderately long, well compressed, fusiform, with greatest 

 depth about ventral origin, and edges all convexly rounded. Caudal 

 peduncle compressed, moderate, and least depth about If in its length. 



Fig. 4. — Nannostomus stigmascnnon Fowler. (Type.) 



Head rather robust, conic, profiles more or less similar, and convex 

 sides not constricted above or below, these surfaces also widely 

 convex. Snout short, nearly triangular as viewed from above, 

 though with rounded tip, and length less than width. Eye large, 

 slightly ellipsoid, anterior, without adipose or free eyelids. As seen 

 from below, eyes quite lateral, protrude out convexly on each side 

 of head, area across mandible appearing much narrower than inter- 

 orbital space. Mouth small, terminally superior, with short com- 

 missure. Teeth not evident. Lips apparently not free, though 

 fleshy. Mandible protudes slightly in front beyond snout tip. 

 moderate, and with rami but little elevated inside mouth. ]\Iaxillary 

 oblique, well inclined, reaches back nearly opposite front eye edge. 

 Nostrils small, inconspicuous, on upper sides of snout. Interorbital 



