eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 149 



Head 4-4.66; depth 5-6; Br. 8-9; D. 7; A. 12; eye 3-4 in the snout, 2-3 

 in the interorbital, 7-8 in the head. 



Barbels flat, those of the maxillary reaching to the end of the adipose or beyond. 

 Color uniform light brown, or with spots on the sides and adipose. 



Subfamily Pimelodin^e. 

 Pinirampus Bleeker. 

 Pinirampus Bleeker, Ichth. Arch. Ind. Prodr., I, 1858, 198 (pirinampu). 

 Pirinampus Gunther, Catalogue, V, 1864, 135. 

 Type, Pimelodus pirinampu Spix. 



Barbels broad, flat with a membranous border behind; first dorsal and pec- 

 toral rays articulate, not pungent; adipose fin much longer than the anal fin; no 

 teeth on the vomer. A single species. 



26. Pinirampus pirinampu (Spix). 

 "Mairipak." 



Pimelodus pirinampu Spix, Gen. et Spec. Pise. Bras., 1829, 20, pi. 8 (Brazil). — 

 Schomburgk, Fishes Brit. Guiana, I, 1841, 183 (Guiana). — Castelnau, Anim. 

 Am. Sucl, Poiss., 1855, 35 (Amazon). 



Pinirampus pirinampu Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2), I, 

 1888, 121 (Cameta); Occasional Papers Cal. Acad. Sci., I, 1890, 104.— Eigen- 

 mann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 383. 



Pimelodus pirinampus Cuvier and Valenciennes, Hist. Nat. Poiss., XV, 1840, 196 

 (Brazil).— ? Kner, SB. Akad. Wiss. Wien, XXVI, 1857, 416 (locality?). 



? Pimelodxis barbancho Humboldt, Rec. Obs. Zool., II, 1833, 172 (Venezuela). 



Pinirampus typus Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 100 (name only). 



Pirinampus typus Gunther, Catalogue, V, 1864, 135 (copied). 



A single specimen of this species 770 mm. long from the falls of the Mazaruni 



was secured for me by Mr. Fowler, Commissioner of Lands and Mines. (C. M. 



Cat, No. 2490.) 



Head 4.66, depth about 6; D. 1,6; A. 11; eye 5.5 in the snout (3.5 in young), 



10.75 in the head (7.5 in young), 5 in the interorbital (2.5 in young); adipose 2.2 



in the length. 



Head depressed, snout parabolic, body subterete, slightly compressed above; 



caudal peduncle subterete. First dorsal ray prolonged, longer than the head. 



Pectoral spine equal to the head in length, not prolonged; adipose dorsal beginning 



near middle of last dorsal ray; maxillary barbel extending to end of ventrals. 

 Steel blue above, white below. 



