1 68 EIGENMANN AND WARD 



Geographical distribution of the species : Orinoco and 

 Giiianas south to Rio de la Plata. ^ 



a. Eye equidistant from tips of snout and pectoral; distance of center 

 of eye from gill-opening 2 in length of snout; eye 13 to 19 in 

 head; anus in front of eye; A. 390 to 515 ; depth about 1.2 in 

 head; brownish, variously spotted and banded. rostrattis^ 15. 

 aa. Eye nearly equidistant from tip of snout and gill-opening; dis- 

 tance of center of eye from tip of opercle i to 1.2S in snout. 



inarmorattis^ 16. 

 aaa. Distance of eye from tip of opercle 1.5 in length of snout. 



i'einha7'dtii^ 17. 



15. RHAMPHICHTHYS ROSTRATUS (Linnaeus). 



Seba, Thesaur, II, tab. 69, fig. 3, and III, 99, tab. 32, fig. 5. 



Gyninottis Gronow, Mus. Ichthyol., no. 73, 1754; Gronow, 

 Zoophyl., no. 167. 



Gymnotus rostratiis Linnaeus, Syst. Nat., ed. XII, i, 428, 

 1766; Gronow, Syst., ed. Gray, 22, 1854. 



Cai'aftis rostratiis, Cuvier, Regne Animal, II, 237, 1817. 



Rhamphichthys roslraUis^ Miiller & Troschel, Horae Ichthyol., 

 Ill, 15, 1849 (Guiana); Giinther, Cat., VIII, 5, 1870 (Suri- 

 nam ; Brit. Guiana) ; Eigenmann & Eigenmann, Proc. U. 

 S. Nat. Mus., XIV, 1891, 62. 



Gymnotus longirostrattis Lacepede, Hist. Nat. Poiss., II, 178, 

 1800. 



Rhaniphichthys schomhurgkii Y^dM\^, Apod., 135, 10, 1856; 

 Steindachner, Die Gymnotida?, 10, 1868, Rio Negro. 



Rhamphichthys sdineidcri Kaup, Apod., 136, fig. 11, 1856, 

 Cayenne. 

 Habitat : Guianas to Amazon. 



16. RHAMPHICHTHYS MARMORATUS Castelnau. 



Rhamphichthys ma7'inoratus Castelnau, Anim. Amer. Sud, 

 Poiss., 86, pi. 46, fig. 2, 1855, Uraguay ; Kaup, Apod., 132, 

 fig- 7> 1856, Eigenmann & Eigenmann, Proc. U. S. Nat. 

 Mus., XIV, 1891, 62 ; Eigenmann, Ann. N. Y. Ac. Sci., 

 VII, 1894, 625 (Itaituba). 



' It seems quite probable that the " species " are simply different forms of a 

 single variable species. 



