220 FISHES OF WESTERN SOUTH AMERICA 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 432; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 350; 
Eigenmann, 1921, Mem. Mus. Comp. Zool., XLII, iti, 227. 
Type: Astyanax argentatus Baird and Girard 
Most of tropical America from Mexico to Patagonia 
Small, usually very small, tetragonopteroid, compressed, more or less elon- 
gated; premaxillary with two series of teeth, the first series with several teeth; 
mandible with strong teeth in front and very small or minute teeth laterally, and 
no teeth of conical form in the second series; maxillary with few teeth or none. 
Anal fin short and moderate; caudal naked; lateral line complete; gill-rakers 
setiform; no predorsal spine, predorsal line scaled. 
246. ASTYANAX ASYMMETRICUS Higenmann 
Astyanax asymmetricus Eigenmann, 1908, Bull. Mus. Comp. Zool., LI, 94; 
Figenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 432; 
EKigenmann, 1921, Mem. Mus. Comp. Zool., XLII, iii, 238, pl. xli, fig. 2. 
Tabatinga and Peruvian Amazon 
15885, 1, 52 mm., Rio Morona, Allen, October, 1920. 
A. 26; scales 11—51-9. Except for this specimen, known from the three types 
collected by Bourget of the Agassiz expedition. Identifiable by the triangular, or 
spindle-shaped caudal spot, dividing the lobes. 
247. ASTYANAX BIMACULATUS (Linnaeus) 
Albula maculata Linnaeus, 1754, Mus. Adolphi Fred., 78, tab. xxxii, fig. 2. 
Charax no. 54 Gronow, 1754, Mus. Iechth., 19, tab. 1, fig. 5. 
Salmo bimaculatus Linnaeus, 1758, Syst. Nat., ed. x, I, 311; 
Linnaeus, 1766, Syst. Nat., ed. xii, 513; 
Bloch, 1794, Ausl. Fische, VIII, 110, taf. 382, fig. 2; 
Bloch and Schneider, 1801, Syst. Ichth., 413. 
Charax bimaculatus Gronow, ed. Gray, 1854, Syst. Ichth., 154. 
Tetragonopterus maculatus Miller and Troschel, 1845, Horae Ichth., I, 14, tab. iii, fig. 4. 
Astyanax bimaculatus Fowler, 1906, Proc. Acad. Nat. Sei. Phila., LVIIT, 482, Peruvian Amazon, 
etc.; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 432; 
Figenmann, 1912, Mem. Carnegie Mus., V, 359; 
Eigenmann, 1921, Mem. Mus. Comp. Zool., X LITT, ii, 249; 
Pearson, 1924 (1925), Ind. Univ. Studies, no. 64, 40, Rio Beni; 
Pearson, 1937a, Proc. Cal. Acad. Sei., (4), X XIII, 91, Pusoe and Paipay, upper Maranon; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sei. Phila., XCI, 263, one, 87 mm., Contamana. 
Tetragonopterus bartletta Giinther, 1866, Ann. Mag. Nat. Hist., (3), X VIII, 30, upper Amazon; 
Cope, 1871, Proce. Acad. Nat. Sci. Phila., XXIII, 260, Rio Ambyiacu. 
Astyanax bartlett? Fowler, 1906, Proc. Acad. Nat. Sei. Phila., LVIII, 348, fig. 31, Rio Ambyiacu. 
Astyanax lacustris Fowler, 1906, Proc. Acad. Nat. Sci. Phila., LVIII, 483, Peruvian Amazon. 
