ANNOTATED LIST OF THE SPECIES 219 
Acrobrycon ipanquianus Eigenmann and Pearson, 1924, Ind. Univ. Studies, no. 64, 44, Espia, 
Bolivia; 
Kigenmann, 1927, Mem. Mus. Comp. Zool., XLII, iv, 416, pl. lxix. figs. i and 2; pl. Ixxxv, 
fig. 1. 
Rio Urubamba to northern Bolivia 
15076, many, 57-103 mm., Ollantaitambo, Eigenmann, November, 1918. 
16052, , , San Miguel, Eigenmann, November, 1918. 
16053, 2, 105 and 117 mm., Lake Huatana, Kigenmann, November, 1918. 
16054, 2, 87 and 118 mm., Ureos, Rio Urubamba, Eigenmann, November, 1918. 
16055, many, 28-125 mm., Torontoi, Rio Urubamba, Eigenmann, November, 1918. 
16056, 1, 70 mm., Pueblo Urubamba, Eigenmann, November, 1918. 
16193, many, 56-116 mm., San Miguel, Eigenmann, November, 1918. 
Like Hemibrycon pectinatus and polyodon, etc., in the reduced anal radii and 
maxillary teeth; differing in smaller and more numerous scales. 
Genus 95: PHENACOGASTER Eigenmann 
Tetragonopterus (in part) Cope, 1870, Proc. Amer. Phil. Soc., XI, 560. 
Astyanax (in part) Fowler, 1906, Proc. Acad. Nat. Sci. Phila., LVIII, 341. 
Phenacogaster Eigenmann, 1907, Amer. Nat., X LI, 492, 769; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 366; 
Eigenmann and Myers, 1929, Mem. Mus. Comp. Zool., XLII, v, 442. 
Type: Tetragonopterus pectinatus Cope 
The Guianas to the Amazons 
Anal origin beneath that of the dorsal fin; lateral line complete; scales in front 
of the ventral fins in two series, overlapping in the center; compressiform; fishes 
of small size. 
245. PHENACOGASTER PECTINATUS (Cope) 
Tetragonopterus pectinatus Cope, 1870, Proc. Amer. Phil. Soc., XI, 560; 
Kigenmann and EKigenmann, 1891, Proc. U. 8. Nat. Mus., XIV, 54. 
Astyanax pectinatus Fowler, 1906 (1907), Proc. Acad. Nat. Sci. Phila., LVIIT, 341, fig. 30 (figure 
mislabeled longior). 
Phenacogaster pectinatus Kigenmann, 1907, Amer. Nat., XLI, 769; 
Kigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 481; 
Eigenmann and Myers, 1929, Mem. Mus. Comp. Zool., XLII, v, 443, pl. Ixvin, figs. 2-5. 
Tetragonopterus tabatingae Steindachner, 1876, Sitzb. KIX. Akad. Wiss. Wien, XLVI, 35, Tabatinga; 
Kigenmann and Eigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 53. 
Tetragonopterus bairdit Steindachner, 1882 (1883), Denksch. Kk. Akad. Wiss. Wien, XLVI, 35, 
Peruvian Amazon to Tabatinga; Cudajas. 
Phenacogaster bairdi Kigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 481. 
Maranon and Solimoes rivers 
Genus 96: ASTYANAX Baird and Girard 
Astyanax Baird and Girard, 1854, Proc. Acad. Nat. Sci. Phila., VII, 26; 
Eigenmann, 1907, Ann. Carnegie Mus., IV, 127; 
