242 MEMOIRS OF THE CARNEGIE MUSEUM 



Head 4.5; depth 6.6; D. 1.6; A. 12; eye 3.33 in the head, intcrorbital 5.5; 

 center of eye a little behind the middle of the head; adipose 3.5 in the length. 

 Maxillary barbel extending to middle of adipose on one side, to near its end on 

 the other. Distance between snout and dorsal fulcrum 3.2 in the length; dorsal 

 spine a little more than snout and eye. Pectoral spine very little longer than 

 dorsal spine, with 16-18 recurved teeth on about the basal three-fourths of the 

 posterior face of the spine. Anterior face with 4 hooks near the tip and about 

 40 short teeth along the rest of the spine. Humeral spine extending considerably 

 beyond the middle of the pectoral spine. Lower caudal lobe longer than the 

 head. Occipital process of the same width throughout, its width 3 in the length. 

 A narrow, dark, lateral band; dorsal without a light band. 



11. Pimelodella cyanostigma (Cope). 

 Rhamdia cyanostigma Cope, Proc. Am. Phil. Soc, 1870, p. 569 (Pebas); Eigenmann 



& Eigenmann, Occasional Papers Cal. Acad. Sci., I, 1891, p. 164. 

 Pimelodus cyanostigma Cope, Proc. Am. Phil. Soc, 1878, p. 675. 

 Pimelodella cyanostigma Fowler, Proc. Acad. Nat. Sci. Phila., 1915, p. 218. (Note 



on the relationship.) 



Habitat. — Maranon Basin. 



Known only from the types. A specimen in the Field Museum, originally 

 about 65 mm. long, collected by Anderson and Becker at Boa Vista, Serra da Lua, 

 Feb., 1913, may belong to this species. The pectoral spines have been broken off, 

 and a definite identification is impossible. 



12. Pimelodella megalops Eigenmann. 

 Pimelodella megalops Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 

 1910, p. 389; Mem. Carnegie Mus., Vol. V, 1912, p. 169, plate XV, fig. 2 

 (Tumatumari, Potaro River; Crab Falls, Essequibo River). 

 Habitat. — Near mouth of the Potaro River, British Guiana. 



13. Pimelodella brasiliensis (Steindachner). 



Pimelodus (Pseudorhamdia) brasiliensis Steindachner, Sb. Ak. Wiss. Wien, 



LXXIV, 1876, Siisswasserf. Sudostl. Bras., Ill, p. 50, pi. VII (Rio Parahyba). 

 Pimelodella brasiliensis Eigenmann & Eigenmann, Proc. Cal. Acad. Sci., (2), I, 



1888, p. 133; Occasional Papers Cal. Acad. Sci., I, 1890, p. 162; Proc. U. S. 



Nat. Mus., XIV, 1891, p. 29; Eigenmann, Reports Princeton Univ. Exped. 



Patagonia, III, 1910, p. 389. 

 Rhamdia brasiliensis Ribeiro, Fauna Bras., Peixes, IV, 1912, p. 275. Known only 



by the types from the Rio Parahyba. 



