100 FISHES OF WESTERN SOUTH AMERICA 
36. PIMELODELLA HASEMANI EHigenmann 
Pimelodella lateristriga Eigenmann and Eigenmann (part), 1890, Occ. Papers Cal. Acad. Sci., I. 156 
Pimelodella hasemani Eigenmann, 1917, Mem. Carnegie Mus., VII, 241, pl. xxx, fig. 1. 
Valleys of the upper Amazon and Madeira 
15862, 6, 93-120 mm., Rio Morona, Allen, October, 1920. 
15863, 9, 43-77 mm., creek Rio Morona, Allen, October, 1920. 
15864, 4. 60-122 mm., Rio Huallaga, Yurimaguas, Allen, November, 1920. 
15865, 8, 63-78 mm., Rio Paranapura, Yurimaguas, Allen, November, 1920. 
37. PIMELODELLA BOLIVIANA Eigenmann 
Pimelodella boliviana Eigenmann, 1917, Mem. Carnegie Mus., VIT, 245, pl. xxxi, fig. 2, Santa Cruz 
de la Sierra, Bolivia. 
Peruvian and Bolivian piedmont 
15866, 7, 60-92 mm., Lago Cashiboya, Allen, August 1920. 
38. PIMELODELLA CRISTATA Miiller and Troschel 
Pimelodus cristatus Miller and Troschel, in Schomburgk, 1848, Brit. Guiana, 628; 
Miller and Troschel, 1849, Horae Ichth., III, 4, Essequibo; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 117; 
Steindachner, 1882 (1883), Denksch. KIx. Akad. Wiss. Wien, XLVI, 4, Rio Huallaga. 
Pimelodella cristatus Eigenmann and Eigenmann, 1888, Proc. Cal. Acad. Sei., (2), I, 182; 
EKigenmann and Eigenmann, 1890, Occ. Papers. Cal. Acad. Sei., I, 150. 
Pimelodus agassizii Steindachner, 1876, Sitzb. KK. Akad. Wiss. Wien, LX XIV, 99, Peruvian 
Amazon. 
Pimelodus ophthalmicus Cope, 1878, Proc. Amer. Phil. Soc., XVII, 675, Peruvian Amazon. 
Pimelodella cristata Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 388; 
Eigenmann, 1917, Mem. Carnegie Mus., VII, 236. 
Whole of Amazon basin southward to C. San Roque 
15958, , Iquitos, Morris, 1922. 
39. PIMELODELLA MONTANA Allen, sp. nov. 
Plate XIII, fig. 2 
17830, 5, 86-91 mm., standard length, Rio Huallaga, Hudnuco, Allen, October, 1918. 
While the Pimelodellas are generally fishes of moderate elevation, hitherto 
known to reach occasionally up to 1800 feet, the present species was collected at 
three times that height above sea level. Near cristata on the basis of the structure 
of the pectoral spine, but differing in the dark head and lateral band. 
Head 4.3-4.5; depth 5.3-5.4; adipose fin 3.2-3.7 in the length, tapering 
toward the head, the latter half being of about uniform depth; D. I, 6, truncate; 
P. 1, 8-9; V. 7; A. 8-9. Peetoral spine 1.8 in head, serrae on its hind margin 
smooth and not retrorse, strongest on the middle third, diminishing proximally, 
and wanting on the distal fourth; serrae of its cephalic margin strong on the distal 
half, diminishing to the point of extinction on the proximal half. 
