1382 MEMOIRS OF THE CARNEGIE MUSEUM. 
Ground-color uniform yellowish; top of head and mid-dorsal region, also 
parts of the caudal portion of the body, more or less sparsely covered with minute 
black dots; fins hyaline, anal rays very weakly colored with a clear light brown. 
Distribution: Lower, Middle, and Upper Amazons. 
V. SrearoGENnes Boulenger. 
Steatogenes BouULENGER, Trans. Zool. Soc. London, XIV, 1898. 
Type, Rhamphichthys elegans Steindachner. 
With fontanels; no caudal; snout short; distinguished from all the other Gymno- 
tids by the presence of a small cylindrical filament of tissue in a groove on each side 
of the mental region; otherwise as in Hypopomus. Size rather small, not exceeding 
250mm. Fore part of body heavy, caudal portion tapering rapidly into the caudal 
filament; head chubby; gape short; teeth wanting; mouth rather small; eyes small, 
covered by a transparent membrane. Scales cycloid, lateral line complete and 
straight. 
Fia. 6. Steatogenes elegans (Steindachner). 
8. Steatogenes elegans (Steindachner). 
Rhamphichthys (Brachyrhamphichthys) elegans StEINDACHNER, Fisch-f. Cauca and 
Guayaquil, 37, 1880 (Barra do Rio Negro). 
Brachyrhamphichthys elegans EK1GENMANN AND EIGENMANN, Proce. U.S. Nat. Mus., 
XIV, 1891, 62. 
Steatogenys elegans BOULENGER, Trans. Zool. Soc., XIV, 428, 1898 (Rio Jurua); 
EIGENMANN AND WARD, Proc. Wash. Acad. Sci., Vol. VII, 1905, 171 (Barra 
do Rio Negro); E1GENMANN AND BEAN, Proc. U. 8S. Nat. Mus., XX XI, 666, 
1907 (Lower Amazon); von InpRING, Os Peixes do Brazil, Part 1 A, 1907; 
EIGENMANN, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 449 (Barra 
do Rio Negro and Guiana). 
