ANNOTATED LIST OF THE SPECIES 323 
gape long, nearly reaching the vertical from the eye; teeth in both jaws; in other 
respects much as A pteronotus and other members of the subfamily. 
KEY TO THE SPECIES OF THE GENUS POROTERGUS 
a. Mouth inferior, minute; rictus between the nostrils; snout very blunt, about 4 in the head 
So 5 Bothd Slo O05 qo CHojolg Ulm oEO 5 Sicotrizebls geutsmelasyie Lisp algeitel isin) ute “o) a), ees yoicst,sus)csshsits}.elt ofish's eis)isu eves gumbeli 
aa. Mouth terminal 
b. Mouth minute, similar to that of Sternopygus macrurus; rictus under anterior nostril; 
snout pointed, 3 in the head oo , terminalis 
bb. Mouth larger, the rictus behind the posterior nostril; snout 2.75 in the head gymnotus 
(extralimital) 
Fic. 35. The Upper Amazon flows so swiftly below the Pongo de Manseriche that launches make 
way upstream with some difficulty. Numerous islands such as this occur. 
451. PoroTERGUS GIMBELI Ellis 
Porotergus gimbeli Ellis (in Eigenmann), 1912, Mem. Carnegie Mus., V, 441; 
Ellis, 1913, Mem. Carnegie Mus., VI, 15+. 
Guiana, Amazons Peru to Para 
15435, 1, 95 mm., Iquitos, Allen, September, 1920. 
Very similar to Sternarchogiton nattereri, but with strong teeth in both jaws. 
Hitherto known only from the types, four specimens from Para and British Guiana, 
collected by Haseman and Ellis respectively. 
