278 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



specimen. Furthermore, in the Panama specimen the maxillary 

 extends well beyond the posterior margin of the eye, instead of extend- 

 ing below the posterior margin as in the Peruvian specimen. 



The large mouth, the densely scaled dorsal and anal, and the 

 rounded caudal distinguish this species from other Peruvian forms. 



Range. — El Salvador to northern Peru. 



CYNOSCION STOLZMANNI (Steindachner) 



Ololithus stolzmanni Steindachner, 1879b, p. 35, pi. 2, fig. 1, Tumbes, Peru 

 (original description; compared with 0. alhus Glinther). 



Cynoscion stolzmanni Meek and Hildebrand, 1925, p. 663, Panama Bay (synon- 

 ymy; description; range). — Tortonese, 1939b, p. 304, Callao, Peru. 



Head 3.5 to 4.0; depth 4.0 to 5.3; D. IX or X-I, 19 to 21; A. II, 



9; P. 18; scales 72 to 86. 



Body quite elongate, its greatest thickness somewhat greater than 

 half its depth; dorsal outline anterior to nape scarcely convex; head 

 rather low, compressed; caudal peduncle long, rather strongly com- 

 pressed, 3.1 in head; snout pointed 3.3 to 4.4; eye 5.2 to 7.6; inter- 

 orbital 5.6; mouth large, oblique; lower jaw strongly projecting; 

 maxUlary reaching nearly or quite to posterior margin of eye, 2.0 to 

 2.3 in head; teeth in jaws anteriorly in three principal series, in two 

 series laterally, upper jaw anteriorly, with a pair of large, recurved 

 canines, the lateral teeth of the outer series in upper jaw somewhat 

 enlarged, and the inner series of lateral teeth in lower jaw enlarged; 

 membranous margin of preopercle crenulate; opercle with two flat 

 spines; gill rakers slender, those at angle about two-thirds length of 

 eye, seven or eight more or less developed on lower and two or 

 three on upper limb of first arch; lateral line decurved, reaching middle 

 of side under origin of second dorsal; scales moderately small, ctenoid 

 (apparently less strongly ctenoid in large examples than in smaller 

 ones), forming a narrow sheath on about one scale at base of second 

 dorsal and anal, few if any extending on these fins, extending on base 

 of caudal and to a lesser extent on base of ventral and pectoral, about 

 nine scales between lateral line and base of first dorsal spine, and 

 eight between it and middle of second dorsal; dorsal fins close together, 

 the spines of the first slender, the fourth the longest, not reaching 

 past the tips of the succeeding ones if deflexed, scarcely longer than 

 the longest soft ray, 1.7 to 2.1 in head; caudal fin somewhat rounded 

 in small examples (about 400 mm. long), almost straight (square) in 

 large examples; anal with concave margin, its origin a little behind 

 middle of second dorsal, its base about 2.8 in head; ventral inserted 

 well behind base on pectoral, quite large, much longer than pectoral, 

 1.6 in head; pectoral small, short, not nearly reaching tip of ventral, 

 1.8 to 2.1 in head, 6.8 to 7.1 in length. 



Color of a large specimen taken at Balboa, Canal Zone, iridescent 



