SOUTH AMERICAN NEMATOGNATHI. 123 



Gill-rakers 3+9. 



Distance of dorsal spine from snout 2f in the length. 

 Dorsal fin. shorter than high, the highest ray 1-| in head. 

 Distance of adipose fin from the dorsal equal to J- the 

 length of the latter. Adipose fin twice as long as the 

 dorsal, 3 in the length. 



Caudal deeply cleft, the lobes longer than the head, 

 about 3 in the length. 



Anal short and high, its free margin narrowly 

 rounded; the highest ray 2 in head. 



Ventrals inserted below the vertical from the last dor- 

 sal ray, 1-J in head. 



Pectoral spine strong, terete, with short hooks on the 

 anterior margin near tip and short teeth nearly the en- 

 tire length of the posterior margin; 1J head. 



A large dark humeral spot; fins all dusky; the usual 

 pale bar on the dorsal fin near its base. 



Head 3J; depth below dorsal spine 5, above first anal 

 ray 4J; depth of caudal peduncle 8; Br. 7; D. I, 6; A. 10. 



Type: No. 7518. Teffe. Agassiz. Length .26 m. 



83, Rhamdia sebse. 



Seba iii, plate 29, fig. 5. 



Rhamdia ou bagre de Rio Marcgrave, 149. 



Mystus No. 83, Gronow, Mus. Ichthyol. i, 34; No. 384, Zoophyl. 125. 



Pimelodus sebce Cuv. & Val. Hist. Nat. Poiss. xv, 169, 1840 (Suri- 

 nam; Cayenne; Rio Janeiro; Buenos Ayres); Hyrtle, Denk. 

 Ak. Wien, xvi, 1859, 16 (vertebras 11+2+26); Quoy & Gaimard, 

 Voy. de Freycinet, Zool. 228, plate xlix, figs 3 and 4; Gttnther, 

 Cat. Fish. Brit. Mus. v, 119, 1864, (Demarara; British Guiana; 

 Brazil). 



Pimelodus (Rhamdia) sebce Steindachner, SB. Ak. Wien, Ixxiv, 

 1876, Siisswasserfische siidostlichen Brasiliens, iii, 68 (Dema- 

 rara; Essequibo; St. Martha, mouth of the Magdalena); 

 Steindachner, Fisch-Fauna, Magd. Stromes, 17, 1878 (Magda- 

 lena) ; Steindachner, Fisch-Fauna des Cauca & Fliisse bie 

 Guayaquil, 7, 1879 (Cauca). 



Rhamdia sebce Eigenm. & Eigenrn. Proc. Cal. Acad. 2d Ser. vol. i, 

 126, 1888, (Tonantins; Gurupa; Eio Janeiro; Bahia; Xingu; 

 Santa Crus; Cudajas; Sao Matheos; Rio Doce; Serpa; Taba- 

 tinga; Goyaz; Para; Teffe; Surinam; Villa Bella). 



