222 FISHES OF WESTERN SOUTH AMERICA 
Mountain streams of eastern Peru 
13672, 1, 116 mm., Yahuarmayo, Peru, purchase. 
16018, , Rio Azupizu, Allen, July, 1920. 
16045, 14, 41-114 mm., Rio Urubamba, Santa Ana, Eigenmann, November, 1918. 
16194, 2, 181 and 220 mm., Rio Huallaga, below Cayumba rapids, Allen, October, 1918. 
17707, 1, 107 mm., same data. 
——, 12, 97-133 mm., Moyobamba, Osgood and Anderson. 
Humeral spot faint or undiscernible altogether; caudal spot large on peduncle, 
narrowing to end of middle rays; head 4.5; depth 2.5; D. 11; A. #8, 4°; scales 7-8; 
38-40; 6; eye 3.3 in the head, 1.5 in the interorbital; rakers 10 + 16, lanceolate, 
slender, but little shorter than filaments which are } the diameter of the eye. 
250. ASTYANAX FASCIATUS (Cuvier) 
Chalceus fasciatus Cuvier, 1819, Mém. Mus. Hist. Nat., V, 352, Brazil. 
Tetragonopterus fasciatus Cuvier and Valenciennes, 1848, Hist. Nat. Poiss., NXIT, 149. 
Astyanax fasciatus Fowler, 1906 (1907), Proc. Acad. Nat. Sei. Phila., LVIII, 346; 
Jigenmann, 1907, Ann. Carnegie Mus., IV, 131; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IT, 433; 
Eigenmann, 1921, Mem. Mus. Comp. Zool., XLIII, iii, 292, pl. xlv, figs. 1-7; pl. xlix, figs. 2 
and 3; pl. i, fig. 2; pl. xev, fig. 1. 
Astyanax carolinae Gill, 1870, Proc. Acad. Nat. Sci. Phila., XXII, 92, Napo or Maranon basin, 
Orton collection. 
Tetragonopterus rutilus Boulenger, 1887, Proc. Zool. Soc. London, 281, Canelos, Ecuador. 
Mexico to Patagonia 
251. ASTYANAX ABRAMIS (Jenyns) 
Tetragonopterus abramis Jenyns, 1842, Zool. Beagle, Fishes, 123, pl. xxiii, fig. 1, Rio Parana. 
Tetragonopterus sp. (?) Cope, 1878, Proc. Amer. Phil. Soc., XVIT, 691, Peruvian Amazon. 
Astyanax abramis Fowler, 1906 (1907), Proc. Aead. Nat. Sci. Phila., LVIII, 439, Peruvian Amazon; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 432; 
Jigenmann, 1921, Mem. Mus. Comp. Zool., XLIIT, ii, 248; 
Pearson, 1924 (1925), Ind. Univ. Studies, no. 64, 40, Rio Beni. 
Orinoco basin to that of La Plata 
Similar to A. bimaculatus, differing in scale number, having a count of 7-8; 
38-49: 6-7; a silvery lateral band, a caudal spot, tapering to the ends of about four 
middle rays. 
Genus 97: CERATOBRANCHIA Eigenmann 
Ceratobranchia Eigenmann, 1914, Ind. Univ. Studies, no. 19, 3; 
HKigenmann, 1927, Mem. Mus. Comp. Zool., XLITI, iv, 356. 
Type: Ceratobranchia obtusirostris Eigenmann 
Central and southern Peru 
Premaxillary teeth in two parallel series, four in each; the tetragonopteroid 
outer series dominant; mandibular teeth graduated; caudal with basal third scaled ; 
