3160 Bulletin 4-f) United States National Museum. 



1157 (c). (HIROSTOMA PROMELAS, Jordan & Snyder. 



Head 3f; depth 4f; depth of caudal peduncle 3 in head; eye 5; snout 

 2 ; iuterorbital space 4 ; height of spinous dorsal 3| ; soft dorsal 2f ; anal 

 2; length of pectoral If; ventral 2^; caudal 1|; D. IV-11; A. 19; pectoral 

 15; scales 53-16, 9 between dorsals. Head slender, triangular; eye small, 

 nearer tip of snout than to edge of opercle by a distance equal to half 

 diameter of pupil; width of preorbital area somewhat greater than 

 diameter of pupil ; interorbital space slightly convex ; snout pointed ; 

 upper jaw projecting a little beyond the lower; cleft of mouth almost 

 horizontal; lips enlarged posteriorly, the lower lip folding over the upper 

 at their junction; angle of mouth on a level with lower part of pupil; 

 maxillary almost vertical in position, its distal end not extending back- 

 ward as far as anterior edge of orbit; teeth large, curved inward, not 

 arranged in definite rows; none on vomer or palatines; vertebrae 45. A 

 tolerably well-defined lateral line extending along the body about 8 scales 

 below the first dorsal, the pores absent on some of the scales; scales 

 creuate, largest along lateral color band; a post-occipital patch of minute, 

 closely-crowded scales extending backward nearly to a line connecting 

 bases of pectorals; a narrow band of similar scales just posterior to gill- 

 openings, and on base of caudal, the latter extending on inter- radial 

 membranes half their length; scales between dorsals not abruptly smaller 

 than those near by, nor crowded closely together; head Avith scales except- 

 on snout, preorbital region, and on lower jaw; first 3 spines of dorsal 

 nearly equal in length, the fourth a little shorter; first dorsal ray longest, 

 the others gradually shorter; anal inserted on a perpendicular passing 

 midway between dorsals, first ray longest, others successively shorter; 

 edge of fin slightly concave; pectoral pointed; extending beyond base of 

 ventrals a distance equal to diameter of pupil; veil trals not quite reaching 

 vent. Color in alcohol, yellowish olive; a distinct silvery lateral baud, 

 the light color of which is underlaid with dark pigment, extending from 

 upper part of base of pectoral to caudal, wider and brighter in color 

 between dorsal and anal, growing narrower on caudal peduncle, widening 

 at its end; scales of upper part of body with dusky coloring on their 

 edges; dorsals, pectoral, and caudal with dark color; eye dusky above, a 

 dark band on interorbital space; snout and jaws black. 



Chirosioma promelas is distinguishable from other known species of the 

 genus by the projecting upper jaw and the black snout. 



One specimen other than the type was obtained. In it the projection 

 of the upper jaw is more pronounced than in the type. The gill -rakers 

 and abdominal viscera had been removed from both. (Jordan & Snyder.) 



Known only from Guadalajara, Jalisco, Mexico, where 2 specimens were 

 obtained in the market. (Type, No. 6156, L. S. Jr. Univ. Mus; Coll. J. O. 

 Snyder.) (npo, before; /^Aag, black.) 



Chirostomapromelas, JORDAN & SNYDEK, Bull. U. S. Fish Com. 1899 (1900), 136, Guadalajara, 

 Mexico. 



