138 MEMOIRS OF THE CARNEGIE MUSEUM. 



Rhamphichthys pantherinus Castelnau, Anirn. Amer. Sud. Poiss., 86, pi. 46, 

 fig. 3, 1855 (Lake near the Ucayale); Kaup, Apod., 131, fig. 6, 1856; Gunther, 

 Cat., VII, 5, 1870; Peters, Mb. Akad. Wiss. BerL, 1877, 473 (Apure); Cope, 

 Proc. Am. Philos. Soc, 1878, 682 (Peruvian Amazon); Steindachner, 

 Fisch-f. Cauca and Guayaquil, 38, 1880 (Manacapuru, Matto Grosso, Surinam, 

 Uruguay, La Plata, Para, Obidos, Xingu, Rio Negro, Ucayale); Perugia, 

 Ann. Mus. Civico Stor. Nat. Genova, ser. 2, vol. X, 55, 1891 (Asuncion and 

 Rio Maciel at Buenos Aires). 



Rhamphichthys lineatus Castelnau, Anim. Amer. Sud. Poiss., 87, pi. 47, fig. 1, 

 1855 (Tributary of Ucayale); Kaup, Apod., 130, fig. 5, 1856. 



Gymnotus rostratus {non Linnffius) Steindachner, Die Gymnotida?, 8, 1868, in 

 part (Matto Grosso, Surinam). 



Rhamphichthys schneideri Kaup, Apod., 136, fig. 11, 1856 (Cayenne). 



Rhamphichthys reinhardtii Kaup, Apod., 132, fig. 8, 1856; Eigenmann and Eigen- 

 MANN, Proc. IT. S. Nat. Mus., XIV, 1891, 62; Eigenmann and Bean, Proc. 

 U. S. Nat. Mus., XXXI, 666, 1907 (Lower Amazon). 



Rhamphichthys blochii Kaup, Apod., 133, fig. 9, 1856; GtJNTHER, Cat., VIII, 5, 

 1860 (Para); Steindachner, Fisch-f. Cauca and Guayaquil, 38, 1880 (Rio 

 Negro, Manacapuru, Para); Boulenger, Trans. Zool. Soc, XIV, 1896, 38 

 (Paraguay); Boulenger, Trans. Zool. Soc, XIV, 428, 1898 (Rio Jaurii). 



1761 C. M., 12612 I. U. M., three, 580-900 mm. Wismar, Eigenmann. 

 3344 C. M., one, 300 mm. Berlin, Rio Mamorc^, 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 peduncle 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 



