252 MEMOIRS OF THE CARNEGIE MUSEUM 
aa. Upper caudal lobe much longer than the lower, much longer than head. 
c. Distal one-third or one-fourth of pectoral spine without hooks, the hooks strong. 
d. Adipose fin 3-3.5 in the length; pectoral spine equal to length of snout and eye; maxillary 
barbels reaching beyond the base of anal. Head 4.5-4.8; depth 5-6; D. 1.6; A. 11-12. 
32. chagresi (Steindachner). 
dd. Adipose fin 2.66-2.75 in the length, pectoral spine a little longer than snout and eye, maxil- 
lary barbel reaching beyond origin of anal. Head 4.75; depth 5.5; D. 1.6; A. 11. 
33. elongata (Ginther). 
cc. Distal half of inner face of pectoral spine without hooks; adipose fin 3.25-3.5 in the length; 
pectoral spine equal to head less half or whole of opercle; maxillary barbels reaching beyond 
tip of ventrals in the small or anal in the large; head 4-4.66; depth 5.5; D. I, 6; A. 11-12. 
34. eutenia Regan. 
29. Pimelodella grisea Regan. (Plate XX XIII, fig. 2). 
Pimelodella griseus REGAN, Ann. and Mag. Nat. Hist., Ser. 7, Vol. XII, 1903, 
p. 625 (Northwestern Ecuador); ErgenmMann, Reports Princeton Univ. Exped. 
Patagonia, III, 1910, p. 389; Recan, Ann. and Mag. Nat. Hist., Ser. 8, Vol. 
XII, 1913, p. 467 (Rio San Juan). 
675la-j C. M., 13588, I. U. M., 41, largest 165 mm., Rio Dagua at Cordova. Eigen- 
mann. 
6752a C. M., 13589, I. U. M., 2, 152 and 155 mm., San Juan half-way between 
Puerto Negria and Istmina. Eigenmann. 
13598 I. U. M., 1, 116 mm., Istmina. Eigenmann. 
Habitat.—San Juan River, Colombia, south to Northern Ecuador. 
30. Pimelodella modesta (Giinther). 
Pimelodus modestus GUNTHER, Proc. Zo6l. Soe. Lond., 1860, p. 239, pl. X, fig. C 
(Esmeraldas); Cat. Fishes Brit. Mus., V, 1864, p. 117 (Esmeraldas); Fish. 
Cent. Amer., 1866, p. 393 (Rio Chagres, Esmeraldas). 
Pimelodella modestus EIGENMANN & EIGENMANN, Proc. Cal. Acad. Sci., (2), 
Vol. I, 1888, p. 183 (mame); Occasional Papers Cal. Acad. Sci., I, 1890, p. 155 
(rivers of Western Ecuador); ErGENMANN, Reports Princeton Univ. Exped. 
Patagonia, IIT, 1910, p. 389. 
Habitat.—Patia, River of southern Colombia to the Chone River in Ecuador. 
6743a-e C. M., 18574 I. U. M., 42, largest 122 mm., Chone, Ecuador. Henn. 
6744a-l C. M., 18575 I. U. M., 19, largest 72 mm., Portovicio. Henn. 
6745a-i_ C. M., 13583 I. U. M., 54, largest 140 mm., San Lorenzo, Rio Telembi, 
Jan. 14, 1918. Henn and Wilson. 
6746a—1_C. M., 18584 I. U. M., 57, iargest 185 mm., Patia, between Magui and 
Telembi. Henn. 
