ANNOTATED LIST OF THE SPECIES 135 
Opsodoras humeralis Eigenmann, 1925, Trans. Amer. Phil. Soc., X XII, 350, pl. 1, fig. 6; pl. ii, fig. 4; 
pl. xvii, figs. 9 and 10; pl. xix, fig. 1. 
Rio Negro to Bolivia and Rio Ucayali 
, 154 mm., Rio Ucayali, Contamana, Allen, July, 1920. 
22, largest 145 mm., Iquitos, Allen, September, 1920. 
CO 
[e/e) 
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Nr 
96. OPSODORAS ORTHACANTHUS Eigenmann 
Opsodoras orthacanthus Eigenmann, 1925, Trans. Amer. Phil. Soc., X XII, 351, pl. xxi, fig. 3; pl. 
xxiil, fig. 2. 
Peruvian Amazons 
15884, 1, 133 mm., type, Iquitos, Morris, 1922. 
15885, 4, 69-82 mm., Lago Cashiboya, Allen, August 1920. 
15886, 3, 77-98 mm., mouth Rio Pacaya, Allen, August, 1920. 
97. OpsopORAS STUBELIT (Steindachner) 
Oxydoras stiibelii Stemdachner, 1882 (1883), Denksch. KK. Akad. Wiss. Wien, XLVI, 5, pl. iii, 
figs. 1-1b, three, 80-120 mm., types, Rio Huallaga. 
Hemidoras stiibeli Eigenmann and Eigenmann, 1888, Proc. Cal. Acad. Sci., (2), I, 158; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., 1, 257; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 394. 
Opsodoras stiibeli Eigenmann, 1925, Trans. Amer. Phil. Soc., X XII, 354, pl. xxvii, figs. 6 and 7. 
Known only from the three types 80-120 mm. in length, in the Vienna Museum. 
The local name shitarz is applied to this species by Steindachner. 
Genus 47: HASSAR Eigenmann and Eigenmann 
Hassar Eigenmann and Higenmann, 1888, Proc. Cal. Acad. Sei., (2), I, 158; 
Eigenmann, 1925, Trans. Amer. Phil. Soc., X XII, 355. 
Type: Oxydoras orestis Steindachner 
Upper Amazon to the Guianas and Paranahyba 
Near Opsodoras and Leptodoras in the lack of scutes on the back; eye elongate, 
snout long and slender, humeral process large and rounded; maxillary barbel 
fringed with minute barblets; adipose not prolonged forward as a ridge. 
Anterior lateral line scutes very small; pectoral spine not reaching, or barely 
reaching, ventrals; mouth large; small patch of minute teeth on the lower jaw; 
anterior nares at or behind middle point between snout and eye. 
98. HASSAR UCAYALENSIS Fowler 
Hassar ucayalensis Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., XCI, 228, figs. 15-17. 
The Ucayali river at Contamana 
Known from the type, 88 mm. long, at the Philadelphia Academy. 
