272 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



thirds its depth; profile convex over snout, nearly straight over 

 orbits, convex at nape; head low and broad; caudal peduncle short, 

 compressed, 2.6 to 2.7 in head; snout somewhat conical, projecting 

 well beyond premaxillaries, 3.4 to 3.75; eye very small, 5.6 to 6.8; 

 interorbital convex, 3.25 to 3.5; mouth nearly horizontal; lower 

 jaw included; maxillary reaching fully to vertical from posterior 

 margin of pupil, 3.0 to 3.2 in head; teeth in a band in each jaw, the 

 one in lower jaw interrupted anteriorly, none of the teeth perceptibly 

 enlarged; preopercle with a ciliated membranous margin; gill rakers 

 moderately stocky, those at angle about as long as pupil, six or seven 

 more or less developed on lower and four on upper limb of first arch; 

 lateral line slightly arched anteriorly, becoming horizontal just 

 posterior to base of anal; scales small, strongly ctenoid, five or six 

 oblique rows between lateral line and first dorsal spine, covering 

 second dorsal and caudal almost completely, missing on anal, present 

 on bases of ventral and pectoral; dorsal fins more or less connected 

 by membrane, the spines low and very slender, the third or fourth 

 longest, 1.6 to 2.1 in head; second dorsal long and rather low, highest 

 posteriorly, the longest rays about equal in length to the longest 

 spines; caudal obtusely pointed, the longest rays being just below 

 the middle of fin, the margin above longest rays oblique and very 

 slightly convex, broadly convex below the longest rays; anal small, 

 the spines weak, the second 3.0 to 3.4 in head; ventral inserted 

 immediately behind base of pectoral, reaching (without filament) 

 about halfway to anal in the smaller specimens, somewhat shorter in 

 larger ones, 1.3 to 1.4 in head; pectoral rather long, reaching somewhat 

 beyond tip of ventral (without filament), the fourth and fifth rays 

 longest, about as long as head, 3.75 to 4.2 in length. 



Color grayish brown, with metallic reflections; pale gray to silvery 

 below; a few of the specimens with obscure dark bars; dark lines 

 along the rows of scales; dorsal and caudal fins olive, tending to become 

 dusky toward the margins in some specimens; anal and ventral rather 

 pale, the interradial membranes sometimes dusky, the spine and 

 outer ray of ventral with its filament white; pectoral very dark, 

 except at base, its upper margin conspicuously white. 



The description is based on the five specimens, 190 to 275 mm. 

 (150 to 220 mm. to base of caudal) long, contained in the collection 

 furnished by the Mission, all of which were taken with an otter trawl 

 in the Gulf of Guayaquil, off Puerto Pizarro. The specimens agree 

 with a " CO type" from Panama Bay, with which they were compared. 

 This species may be distinguished from the others herein described 

 by the very small eye, the long, dark pectoral with a conspicuously 

 white upper margin, the densely scaled second dorsal, naked anal, 

 and small scales. 



Range. — Panama Bay to northern Peru. Heretofore known only 

 from Panama Bay. 



