314 FISHES OF WESTERN SOUTH AMERICA 
Type: Rhamphichthys elegans Steindachner 
Range that of the one species 
Hypopomus-like, but with a groove on either side of mental region, within 
which is a small filament; fontanels present; no caudal fin; snout bluntly rounded; 
body broad forward, tapering rapidly; gape short; without teeth; eyes small, 
within membrane. 
436. STEATOGENYS ELEGANS (Steindachner) 
Rhamphichthys elegans Steindachner, 1880, Denksch. KI<. Akad. Wiss. Wien, XLII, 37. 
Brachyrhamphichthys elegans Eigenmann and Eigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 62. 
Steatogenys elegans Boulenger, 1898, Trans. Zool. Soc. London, XIV, 428, Rio Jurud; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 449; 
Bigenmann, 1912, Mem. Carnegie Mus., V, 432. 
Steatogenes elegans Figenmann and Ward, 1905, Proc. Wash. Acad. Sci., VII, 171; 
Ellis, 1913, Mem. Carnegie Mus., VI, 132. 
Solimoes and tributaries, Guianas 
15717, 4, about 130-210 mm., Iquitos, Allen, September, 1920. 
Genus 173: HYPOPOMUS Gill 
Hypopomus Gill, 1864, Proc. Acad. Nat. Sei. Phila., XVI, 152, miillerz; 
Eigenmann and Ward, 1905, Proc. Wash. Acad. Sei., VII, 169; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 449; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 433; 
Ellis, 1913, Mem. Carnegie Mus., VI, 133. 
Type: Rhamphichthys millert Kaup 
Cauca, Guianas, southward to Peru and Rio Paraguay 
Belonging to the short-snouted, edentulous category, without caudal fin, and 
eyes without free orbital margin; body slender, tapering; mouth and gape small; 
eyes moderate and enclosed by a membranous fold of the skin; scales small, cycloid, 
lateral line complete; anal fin originating about the length of the pectoral behind 
a vertical line through the gill-opening. 
437. HyporpoMUS BREVIROSTRIS (Steindachner) 
Rhamphichthys brevirostris Steindachner, 1868, Sitzb. KIX. Akad. Wiss. Wien, LVIII, 254, pl. ii, 
fig. 2. 
Brachyrhamphichthys brevirostris Eigenmann and Kigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 62. 
Hypopomus brevirostris Bigenmann and Kennedy, 1903, Proc. Acad. Nat. Sei. Phila., 530; 
Eigenmann and Ward, 1905, Proc. Wash. Acad. Sci., VII, 170; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 449; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 433; 
Ellis, 1913, Mem. Carnegie Mus., VI, 134; 
Schindler, 1937, Zool. Anz., CXTX, 19-25, 11 figs. 
