280 Fretp Museum or Natura. History — Zod oey, Vor. X. 
on side; maxillary with a few or no teeth; gill-rakers setiform; lateral 
line complete; no predorsal spine; caudal naked. 
KEY TO THE SPECIES. 
a. Sides with a dark, plumbeous, lateral band, darkest and most 
distinct posteriorly, sometimes indistinctly visible on caudal fin; 
no caudal spot. Reaching a length of 150 mm. fasciatus, p. 280. 
aa. Sides with a plumbeous, lateral band, ending in a large, well 
defined, oval caudal spot. RenernnG a length of 110 mm. 
agin ea p. 281. 
29. Astyanax fasciatus (Cuvier). 
Chalceus fasciatus Cuvier, Mem. Mus. Paris, V, 1819, 352 (Brazil). 
Tetragonopterus fasctatus Cuvier & Valenciennes, Hist. Nat. Poiss., XX, 
1848, 149 (Rio San Francisco); Gunther, Cat. Fish. Brit. Mus., V; 
1864, 322 (Brazil; ? West Ecuador; ? Rio Chisay; ? Mexico; Guate- 
mala); Vaillant, Bull. Mus. d’Hist. Nat. Paris, 1897, 221 (? Chagres). 
Tetragonopterus fischeri Steindachner, Denkschr. K. Ak: Wiss. Wien, 
XLI, 1879, 166, Pl. I, figs. 1 & 2 (Rio Mamoni, Panama). 
Tetragonopterus panamensis (non Giinther) Steindachner, Denkschr. 
K. Ak. Wiss. Wien, XLI, 1879, 166, Pl. I, figs. 1 & 2 (Rio Mamoni, 
Panama). 
Astyanax fasciatus Fowler, Proc. Ac. Nat. Sci. Phila., 1906, 346 (Para). 
Astyanax rutilus Eigenmann & Ogle, Proc. U.S. Nat. Mus., XXXIII, 
1907, 19 (Truando; West Coast of Central America). 
Astyanax grandis Meek & Hildebrand, Field Mus. Nat. Hist. Pub., 
Zool. Ser., X, 1912, 67 (Rio Juan Diaz, Panama). 
Head 3.55 to 4.35; depth 2.35 to 2.6; D. ro or 11; A. 25 to 27; scales 
36 to 39. : 
Body deep, compressed; the back elevated; head small; snout coni- 
cal, 3.7 to 4.4 in head; eye 2.6 to 3.6; interorbital 2.4 to 3; mouth small; 
jaws subequal; maxillary to or slightly past anterior margin of eye, 
slightly longer than snout; premaxillary teeth in 2 regular series, each 
with 8 teeth; maxillary with 2 small teeth near its juncture with the 
premaxillary; lower jaw with 8 strong teeth anteriorly and abruptly 
smaller ones at sides; gill-rakers short, about 12 on lower limb of first 
arch; lateral line complete, very slightly decurved; scales rather large, 
striate, 11 or 12 in advance of dorsal, 9 to 11 between dorsal and adipose, 
7 or 8 longitudinal rows between anterior rays of dorsal and lateral line; 
dorsal fin inserted a little nearer tip of snout than base of caudal, the 
anterior rays longest, reaching past tips of posterior rays; adipose fin 
about one-third as far from base of upper caudal ray as from base of 
last dorsal ray; caudal fin forked, the lobes of about equal length; anal 
