126 CALIFORNIA ACADEMY OF SCIENCES. 



tinga; Goyaz; Para. The three Para specimens have a 

 shorter and less angular head; head 4J in the length. 

 Teffe have the head more pointed; Surinam: maxillary 

 barbel much shorter on one side than on the other; 

 Rio de Janeiro head angular; Villa Bella .09 m. spec, 

 nov. ? head 3J in the length; ventrals almost to anal; 

 pectoral spine If in head; maxillary barbels beyond 

 base of caudal; adipose 2f. 



83a. Rhamdia sebae kneri, 



Pimelodus sebce Kner, SB. Ak. Wieii, xxvi, 417, 1857, (Marabitanos); 



not P. sebca C. & V. 

 Pimelodus (Rhamdia) kneri, Steindachiier, SB. Ak. Wien, Ixxiv, 



1876, Siisswasserfische siidostl. Bras, iii, 73, foot note (Cujaba). 

 Rhambia sebce kneri Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. 



i, 126, 1888 (Tabatinga; Jutahy). 

 ? Pimelonotus vilsoni Gill, Ann. Lye. Nat. Hist. N. Y. vi, 391, 1858 



(Trinidad). 

 IPimelodus wilsoni Giinther, Cat. Fish. Brit. Mus. v, 122, 1864 



(copied); Jordan, Proc. U. S. Nat. Mus. 1886, 559 (name only). 

 Rhamdia queleni Bleeker, Silures de Suriname, 75, 1864 (Surinam). 

 Habitat: Upper Paraguay and northward. 



The specimens examined are from Tabatinga and 

 Jutahy. This variety differs from sebce only in the size 

 of the eye. "Eye in young 3| in head," in specimens 

 .27 m. long, 5|; "head in young 5 in the length," in 

 adult 4J; adipose fin " in young less than 2 in the 

 length," in adult 2| 3. Jaws equal or the lower shorter. 



P. vilsoni seems to differ from kneri only in having a 

 projecting lower jaw. 



84, Rhamdia foina, 



Pimelodus foina Miiller & Troschel, Schomburgk, British Guiana, 

 628, 1848 (Takutu); Miiller & Troschel, Horse Ichthyol. iii, 5, 

 1849 (Guiana); Giinther, Cat. Fish. Brit. Mus. v, 130, 1864 

 (copied). 



Rhamdia foina Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. i, 

 126, 1888 (name). 



Habitat: Guiana. 



85, Rhamdia humilis. 



Pimelodus humilis Giinther, Cat. Fish. Brit. Mus. v, 129, 1864 

 (Venezuela); Cope, Proc. Am. Philos. Soc. xvii, 1878, 674 (Peru- 

 vian Amazon). 



