Dec. 28, 1916. Fiswes or 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 Ginther) Gill, Desi Adin Olas Sci. 
Phila., 1876, 336 (Rio Frijoles, Atlantic slope, Panama). 
Astyanax ‘fisciers (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 
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