Dec. 28, 1916. Fishes of Panama — Meek and Hildebrand. 281 



fin rather long, its origin a little behind base of last dorsal ray, about 

 midway between base of pectorals and base of caudal, its base much 

 longer than head; ventral fins reaching to or slightly past vent, inserted 

 midway between tip of snout and base of last anal ray; pectoral fins 

 reaching nearly or quite to base of ventrals, inserted about midway 

 between tip of lower jaw and base of ventrals. 



Color silvery; back dark green, with bluish and silvery reflections; 

 pale silvery below; no caudal spot. Sides with a plumbeous band, 

 most distinct on caudal peduncle; a black shoulder spot present and 

 sometimes a second indistinct spot an eye's diameter behind the first. 

 Fins plain translucent in spirits. Dorsal and pectorals dark green in 

 life; other fins bright red. 



This species is represented in the Panama collection by 522 speci- 

 mens, ranging in length from 60 to 150 mm. It occurs only in the 

 Pacific slope streams in Panama. Apparently one of the later migrants 

 from the Atlantic streams of Colombia. 



Habitat: Western slope of Central America, Panama, Colombia, 

 and Ecuador, and the eastern slope from Para to Napo. 



30. Astyanax ruberrimus Eigenmann. 



Tetragonopterus panamensis (non Gunther) Gill, Proc. Ac. Nat. Sci. 



Phila., 1876, 336 (Rio Frijoles, Atlantic slope, Panama). 

 Astyanax fischeri (non Steindachner) Eigenmann & Ogle, Proc. U. S. 



Nat. Mus., 1907, 26 (Pacific slope of Panama; Rio Frijoles; Empire; 



Panama); Evermann & Goldsborough, Proc. Biol. Soc. Wash., 



XXIII, 1910, 4 (Empire, Canal Zone). 

 Astyanax ruberrimus Eigenmann, Indiana Univ. Studies, No. 18, 1913, 



25 (Istmina, Atlantic slope, Colombia). 



Head 3.4 to 4.18; depth 2.2 to 3.15; D. 10 or 11; A. 22 to 27; scales 

 34 to 38. 



Body short, compressed, the back elevated; head small; snout 

 conical, 3.5 to 4.75 in head; eye 2.5 to 4.5; interorbital 2.45 to 3.15; 

 mouth small; jaws subequal; maxillary reaching slightly past anterior 

 margin of eye, scarcely as long as snout; premaxillary teeth in 2 regular 

 series, each series with 8 teeth; maxillary with 2 small teeth near its 

 juncture with the premaxillary; lower jaw with 8 large teeth anteriorly, 

 and abruptly smaller ones at sides; gill-rakers short, about 12 on lower 

 limb of first arch; lateral line complete, slightly decurved; scales rather 

 large, striate, 11 or 12 in advance of dorsal, 9 to 11 between dorsal and 

 adipose fin, 6 or 7 longitudinal rows between anterior rays of dorsal and 

 lateral line; dorsal fin inserted midway between tip of snout and base 

 of caudal, the anterior rays the longest, reaching past tips of posterior 



