98 FISHES OF WESTERN SOUTH AMERICA 
Inter-cordilleran streams of northern Peru and Ecuador 
Noteworthy for the great prolongation of the upper caudal lobe. 
Genus 14: PIMELODELLA Eigenmann and Kigenmann 
Pseudorhamdia Steindachner, non Pseudorhamdia Bleeker, 1876, Sitzb. KIX. Akad. Wiss. Wien, 
LXXIV, 46, lateristriga. 
Pimelodella Eigenmann and Eigenmann, 1888, Proce. Cal. Acad. Sei.,(2), I, 131, cristatus; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sei., I, 147; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 338; 
Eigenmann, 1917, Mem. Carnegie Mus., VII, 251-255, pls. xxxiii and xxxiv; 
Eigenmann, 1922, Mem. Carnegie Mus., IX, 28 and 41. 
Type: Pimelodus cristatus Miller and Troschel 
Panama and Pacific coast of Ecuador to La Plata 
Differing from the nearby Pimelodus in the remote nares; the persistent frontal 
and parietal fontanels; the occipital process narrow and uniform in width through- 
out, and extending to the dorsal plate; head covered with non-granular skin; anal 
short (11-15 rays), less than adipose; dorsal and anal rounded; maxillary barbels 
well-developed, reaching to end of pectoral or beyond the caudal; mental barbels 
two pairs, sometimes attached in a straight line transversely; pectoral spine shorter 
than its rays. 
31. PIMELODELLA PURUENSIS Fowler 
Pimelodella puruense Fowler, 1915, Proc. Acad. Nat. Sci. Phila., 214, fig. 4, Peruvian Amazon. 
Pimelodella purwensis FKigenmann, 1917, Mem. Carnegie Mus., VII, 240. 
Peruvian Amazon 
A species known only from the type specimen, 52 mm. in length, which is 
possibly the young of another species; upper caudal lobe not strongly developed, 
but equal to lower; pectoral spine smooth in front, with about nine thorns on inner 
margin; no lateral band; maxillary barbels reaching origin of ventrals. 
32. PIMELODELLA ROCCAE Eigenmann 
Plate X, figs. 4 and 4a 
Pimelodella roccae Eigenmann, 1917, Mem. Carnegie Mus., VII, 240, nom. nud. 
Pearson, 1924, Ind. Univ. Studies, no. 64, 14, Beni basin, Bolivia, nom. nud. 
Middle Urubamba and Beni basin of Bolivia 
———, M.C.Z., type, 182 mm., paratype, 118 mm., Rio Comberciato, 1800 feet elevation, Ed- 
mund Heller. 
Description of the type: head 4.5—-5; depth 5.383-5.66; D. I, 6; A. 12; adipose 
fin 3 in the length; maxillary barbel extending to the base of the anal in the larger, 
to its tip in the smaller; outer mental barbel to near tip of pectoral; eye 6 in the 
head, 2.75 in the snout, 1.5 in the interorbital; interorbital 4 in the head; depth of 
