32 CALIFORNIA ACADEMY OF SCIENCES. 



Maxillary barbels reaching to the base of the ventrals 

 or somewhat shorter; mental barbels reaching little 

 beyond the gill-membrane, or considerably shorter. 

 Jaws subequal, the upper slightly longer, margin of 

 the upper jaw semicircular; teeth on the inter max- 

 illary in two lanceolate patches; vomer 

 with an elliptical band constricted in 

 the middle; palatine teeth in much 

 narrower patches, contiguous to the 

 vomerine patches. 



Gill-membranes joined, free from the isthmus. Gill- 

 rakers long and slender, equal to half the diameter of 

 the eye, 5-6+12-14. 



Distance of dorsal fin from tip of snout 2f-3 in the 

 length; the spine not produced in a filament beyond 

 the following rays, the spinous portion 1| in head, its 

 outer margin roughened; greatest height of the fin If in 

 the length of the head. Adipose fin very short, higher 

 than long; its distance from the' dorsal 2f-2f in the 

 length. 



Caudal deeply forked, 3J-3f in the length. 



Highest anal ray 1J-2J in the head. 



Ventrals inserted under the vertical at a point poste- 

 rior to the dorsal, longer than the length of the dorsal 

 fin, their tips sometimes reaching the anal, IJ-lf in 

 length of head. 



Pectoral spine prolonged in a filament which reaches 

 to the anal fin, sometimes shorter; both margins rough- 

 ened, the length of the spinous portion 1J-1 in the 

 head. 



Steel-blue above with brassy or golden reflections; 

 lower parts silvery; fins with dark points; lower part of 

 sides with similar points. 



Head 3f-4J; depth 4-5|; D. I, 7; A. 28-30. 



Four specimens .26-. 37 m. Panama. 



