138 MEMOIRS OF THE CARNEGIE MUSEUM. 
Rhamphichthys pantherinus Casrrunau, Anim. Amer. Sud. Poiss., 86, pl. 46, 
fig. 3, 1855 (Lake near the Ucayale); Kaur, Apod., 131, fig. 6, 1856; GUNTHER, 
Cat., VII, 5, 1870; Prrers, Mb. Akad. Wiss. Berl., 1877, 473 (Apuré); Cop, 
Proc. Am. Philos. Soe., 1878, 682 (Peruvian Amazon); STEINDACHNER, 
Fisch-f. Cauea and Guayaquil, 38, 1880 (Manacapuru, Matto Grosso, Surinam, 
Uruguay, La Plata, Para, Obidos, Xingu, Rio Negro, Ucayale); PERuetia, 
Ann. Mus. Civico Stor. Nat. Genova, ser. 2, vol. X, 55, 1891 (Asuncion and 
Rio Maciel at Buenos Aires). 
Rhamphichthys lineatus CastELNAv, Anim. Amer. Sud. Poiss., 87, pl. 47, fig. 1, 
1855 (Tributary of Ucayale); Kaur, Apod., 130, fig. 5, 1856. 
Gymnotus rostratus (non Linnseus) STEINDACHNER, Die Gymnotide, 8, 1868, in 
part (Matto Grosso, Surinam). 
Rhamphichthys schneideri Kaur, Apod., 136, fig. 11, 1856 (Cayenne). 
Rhamphichthys reinhardtii Kaur, Apod., 182, fig. 8, 1856; EtGeENMANN AND EIGEN- 
MANN, Proc. U. 8. Nat. Mus., XIV, 1891, 62; E1gENMANN AND Beran, Proc, 
U.S. Nat. Mus., XX XI, 666, 1907 (Lower Amazon). 
Rhamphichthys blochii Kaur, Apod., 133, fig. 9, 1856; Ginruer, Cat., VIII, 5, 
1860 (Para); SrernpAcuNneER, Fisch-f. Cauca and Guayaquil, 38, 1880 (Rio 
Negro, Manacapuru, Para); BouLmnacEr, Trans. Zodl. Soc., XIV, 1896, 38 
(Paraguay); BouLEenGErR, Trans. Zo6l. Soc., XIV, 428, 1898 (Rio Jaurt). 
1761 C. M., 12612 I. U. M., three, 580-900 mm. Wismar, Higenmann. 
3344 C. M., one, 300 mm. Berlin, Rio Mamoré, in Bolivia, Sept. 15, 1909, 
Haseman. 
3348 C. M., three, 390-470 mm. San Joaquim, Sept. 5 and 6, 1909, Haseman. 
3346 C. M., one, 630 mm. Santarem, Dec. 15, 1909, Haseman. 
3347 C. M., one, ? damaged. Santarem, Dec. 15, 1909, Haseman. 
Head 6 to 8; greatest depth 11.3 to 12 in the length to the end of the anal; 
anal rays 410, 444, 469; snout 1.5 to 1.8, interorbital 8.5 to 9.5 in the head; eye 
12 to 16 in the snout, 2.25 to 3 in the interorbital, 18 to 22 in the head. 
Compressed and very elongate; width of head 2.3 to 2.5, depth of head in the 
occipital region 1.5 to 2 in the greatest depth; anus on or in front of the vertical 
from the eye; dorsal profile sloping to the occiput, then almost straight; ventral 
profile quite straight except for a slight concavity in the mental region. 
Snout long, tubular, and tapering; mouth small and slightly below the over- 
hanging upper jaw; gape short and decurved, about 1.5 times the eye; lower jaw 
included, upper forming the extreme tip of the snout, slightly expanded and blunt 
on the end, teeth wanting; cheeks full and round; operculum rather prominent; 
eyes small. 
Caudal pedunele 3.5 to 4 in the total length; pectorals 2.75 in the head; origin 
of the anal about three times the eye behind the vertical from the eye. 
Ground-color chocolate to a yellow-brown; ventral parts lighter; numerous 
