148 MEMOIRS OF THE CARNEGIE MUSEUM. 
the head in the occipital region 1.5 to 1.75 in the greatest depth of the body; anus 
about the diameter of the eye behind the vertical from the posterior margin of 
the eye; dorsal profile almost straight; ventral profile convex. 
Snout heavy and blunt, mouth moderately large; gape somewhat curved 
downward, long, almost reaching the vertical from the anterior margin of the 
eye; jaws equal, lower included on the sides; teeth in two irregular rows in each 
jaw; eyes medium, covered by a membrane; nostrils prominent, the anterior nares 
projecting slightly as little tubercles; upper posterior margin of the operculum 
somewhat angulate; first few scales of the lateral line quite prominent. 
Pectorals 1.3 to 1.6 in the head; origin of the anal on, or slightly in front of, 
the vertical from the gill-opening. 
Ground-color pale buff; body completely covered with extremely fine brown 
dots, causing a brownish shade; top of head lighter, with a more or less distinct 
white band running from middle of snout to beyond the occipital region; sides and 
under parts of the head heavily covered with minute blue-black dots; fins smoky 
to almost black, being colored irregularly. 
The caudal fin and a portion of the caudal region of all of the specimens 
examined were in various states of regeneration. 
20. Sternarchus albifrons (Linn:eus). 
Gymnotus albifrons Linnmus, Syst. Nat., ed. XII, i, 428, 1766; Patuas, Spic. 
Zool., VII, 36, tab. 6, fig. 1, 1769; BonaTerRRE, Tabl. Encyel. des Trois Régnes 
Natura, Poiss., 37, pl. 24, fig. 82, m. 3, 1788. 
Sternarchus albifrons BLocH AND SCHNEIDER, 497, tab. 94; CasTELNAvu, Anim. 
Amer. Sud. Poiss., 91, pl. 45, fig. 1, 1855; Kaup, Apodes, 126; STEINDACHNER, 
Sb. Akad. Wiss. Wien, LVIII, 1868, 249 (Cuyab4); GitnruHEr, Cat., VIII, 
2, 1870 (Parad, Santarem); Perers, Mb. Ak. Wiss. Berlin, 1877, 473 (Apuré); 
Corr, Proc. Am. Philos. Soc., 1878, 282 (Canelos); STEINDACHNER, Flussf. 
Siidam., III, 13, pl. 5, fig. 6, 1881 (Manacapuru, Teffé, Obidos); E1gEnMANN 
AND HKIGENMANN, Proc. U. 8. Nat. Mus., XIV, 1891, 61; Pmruera, Ann. Mus. 
Civico Stor. Nat. Genova, Ser. 2, Vol. 4, 55, 1891 (Asuncion); BouLENGER, 
Trans. Zool. Soc., XIV, 1896, 37 (Descalvados); BouLENnGEr, Boll. Torino, 
XIII, 1898 (Rio Zamora, Ecuador); E1gENMANN AND KENNEDY, Proc. Acad. 
Nat. Sci. Phila., 1903, 30 (Arroyo Trementina); EIGENMANN AND WARD, 
Proc. Wash. Acad. Sci., VII, 1905, 162 (Orinoco, Amazons, Paraguay); VON 
THERING, Os Peixes do Brazil, Part 1 A, 1907; E1genmMANN, Repts. Princeton 
Univ. Exp. Patagonia, III, 1910, 448 (Guiana, Amazons, Paraguay). 
Apteronotus passan LAckPEDE, Hist. Nat. Poiss., II, 209, pl. 6, fig. 3, 1800. 
Sternarchus lacepedii CASTELNAU, Anim. Amer. Sud. Poiss., 93, pl. 45, fig. 3, 1855 
(Surinam), 
Sternarchus maximilliana CASTELNAU, l. c., 93, pl. 45, fig. 4, 1855. 
3193 C. M., one, 400 mm. Pard, Jan. 22, 1910, Haseman. 
