SOUTH AMERICAN NEMATOGNATHI. 123 



Gill-rakers 3-f-9. 



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

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

 Distance of adipose fin from the dorsal equal to 3 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, I4 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; lA head. 



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

 pale bar on the dorsal fin near its base. 



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

 ray 4|; 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 hagre de Rio Marcgrave, 149. 



Mystus No. 83, Gronow, Mus. Ichthyol. i, 34; No.3S4, Zoophyl. 125. 



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

 nam; Cayenne; Rio Janeiro; Biienos Ayres); Hyrtle, Dank. 

 Ak. Wien, xvi, 1859, 16 (vertebr:i3 11+2+26); Qnoy & Gaimard, 

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

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

 Brazil). 



Pimelodns {Rhamdia) sebw. Steindachner, SB. Ak. Wien, Ixxiv, 

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

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

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

 lena) ; Steindaclmer, Fisch-Fauna des Cauca & Fltisse bie 

 Guayaquil, 7, 1879 (Cauca). 



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

 126, 1888, (Tonautius; Guriipa; Eio Janeiro; Bahia; Xingu; 

 Santa Cruz; Cudajas; Sao Matheos; Eio Doce; Serpa; Taba- 

 tiuga; Goyaz; Para; Tefife; Surinam; Villa Bella). 



