ANNOTATED LIST OF THE SPECIES 313 
b. Teeth in both jaws; body much compressed 
ce. Tail normally prolonged. . ne ELGENMANNIA 
Compl xtreme my pLolong.a't] Onl KOlmuall eee fr.) tes eens eee RHABDOLICHOPS 
bb. Teeth wanting; body subeylindrical 
d. A groove on each side of the chin containing a short, wiry filament..sSTEATOGENYS 
dd. No groove in mental region; head rather pointed......... .. .HYPOPOMUS 
Genus 171: STERNOPYGUS Miiller and Troschel 
Gymnotus Cuvier, 1817, Régne Anim., IT, 235; 
Gill, 1864, Proe. Acad. Nat. Sei. Phila., 152. 
Sternopygus Miller and Troschel, 1849, Horae Ichth., III, 18; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 450; 
EHigenmann, 1912, Mem. Carnegie Mus., V, 427; 
Ellis, 1913, Mem. Carnegie Mus., VI, 121. 
Type: Gymnotus macrurus Bloch and Schneider 
Western Ecuador via Magdalena to Rios Paraguay and Sao Francisco 
Differing from the nearby Eigenmannia and all other Gymnotids most strik- 
ingly in the possession of a free orbital margin; caudal fin wanting; teeth in patches 
in both Jaws; snout short, stout. 
435. STERNOPYGUS MACRURUS (Bloch and Schneider) 
Gymnotus macrurus Bloch and Schneider, 1801, Syst. Iehth., 522; 
Cuvier, 1817, Régne Anim., II, 237. 
Sternopygus macrurus Miller and Troschel, 1849, Horae Ichth., III, 14; 
Steindachner, 1868, Sitzb. Kx. Akad. Wiss. Wien, LVIIT, 11; 
Cope, 1871 (1872), Proc. Acad. Nat. Sci. Phila., XXIII, 257, Rio Ambyiacu; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 57; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 450; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 427; 
Ellis, 1913, Mem. Carnegie Mus., VI, 121, fig. 3; 
Pearson, 1937a, Proc. Cal. Acad. Sci., (4), X XIII, 92, Pusoe and Tingo de Pauca, upper 
Maranon. 
Sternopygus carapus Ginther, 1870, Cat. Fish. Brit. Mus., VIII, 7; 
Boulenger, 1887, Proc. Zool. Soc. London, 282, Canelos. 
Carapus sanguinolentus Castelnau, 1855, Anim. Amér. Sud, Poiss., 85, pl. xxxil, fig. 1, Urubamba or 
Alto Ucayali. 
Rio Ormoco to Peru and Paraguay 
15417, 5, 115-127 mm., Rio Pichis, Pto. Bermudez, Allen, July, 1920. 
15424, 1, 93 mm., Rio Morona, Allen, October, 1920. 
Genus 172: STEATOGENYS Boulenger 
Steatogenys Boulenger, 1898, Trans. Zool. Soc. London, XIV, 428; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 449; 
digenmann, 1912, Mem. Carnegie Mus., V, 432. 
Steatogenes Eigenmann and Ward, 1905, Proc. Wash. Acad. Sei., VII, 171; 
Ellis, 1913, Mem. Carnegie Mus., VI, 132. 
