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; ej^es medium, covered by a membrane; nostrils prominent, the anterior nares 

 projecting shghtly 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 (Linnajus). 



Gymnotus albifrons Linn^us, Syst. Nat., ed. XII, i, 428, 1766; Pallas, Spic. 

 Zool., VII, 36, tab. 6, fig. i, 1769; Bonaterre, Tabl. Encycl. desTrois Regnes 

 Natura, Poiss., 37, pi. 24, fig. 82, m. 3, 1788. 



Sternarchus albifrons Block and Schneider, 497, tab. 94; Castelnau, Anim. 

 Amer. Sud. Poiss., 91, pi. 45, fig. 1, 1855; Kaup, Apodes, 126; Steindachner, 

 Sb. Akad. Wiss. Wien, LVIII, 1868, 249 (Cuyaba); Gunther, Cat., VIII, 

 2, 1870 (Para, Santarem) ; Peters, Mb. Ak. Wiss. Berlin, 1877, 473 (Apure) ; 

 Cope, Proc. Am. Philos. Soc, 1878, 282 (Canclos); Steindachner, Flussf. 

 Siidam., Ill, 13, pi. 5, fig. 6, 1881 (Manacapuru, Teffe, Obidos); Eigenmann 

 and Eigenmann, Proc. U. S. Nat. Mus., XIV, 1891, 61; Perugia, Ann. Mus. 

 Civico Stor. Nat. Genova, Ser. 2, Vol. 4, 55, 1891 (Asuncion) ; Boulenger, 

 Trans. Zool. Soc, XIV, 1896, 37 (Descalvados) ; Boulenger, Boll. Torino, 

 XIII, 1898 (Rio Zamora, Ecuador); Eigenmann 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 

 Ihering, Os Peixes do Brazil, Part 1 A, 1907; Eigenmann, Repts. Princeton 

 Univ. Exp. Patagonia, III, 1910, 448 (Guiana, Amazons, Paraguay). 



A-pteronolus passan Lacepede, Hist. Nat. Poiss., II, 209, pi. 6, fig. 3, 1800. 



Sternarchus lacepedii Castelnau, Anim. Amer. Sud. Poiss., 93, pi. 45, fig. 3, 1855 

 (Surinam). 



Sternarchus maximilliana Castelnau, 1. c, 93, pi. 45, fig. 4, 1855. 



3193 C. M., one, 400 mm. Para, Jan. 22, 1910, Haseman. 



