ANNOTATED LIST OF THE SPECIES 113 
Type: Stlurus ima Bloch and Schneider 
La Plata via Amazons to the Magdalena 
A genus of one widely distributed species. Greatly prolonged upper Jaw and 
extremely flattened head; mouth as wide as the widest part of the head; eyes lateral; 
teeth on the roof of the mouth in four patches forming a horse-shoe, vomerine 
patches confluent, maxillary band wider than deep; barbels fleshy; adipose fin 
shorter than anal; dorsal spine midway between snout and posterior extremity of 
adipose; first lateral line plates broad and thin. Fishes often of very large size. 
56. SoruBIM Lima (Bloch and Schneider) 
Silurus lima Bloch and Schneider, 1801, Syst. Iehth., 384. 
Platystoma lima Agassiz, 1829, Sel. Gen. et Spec. Pisc. Bras., 24. 
Sorubim lima Spix, 1829, Sel. Gen. et Spec. Pisce. Bras., 24; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 105; 
Giinther, 1869, Proc. Zool. Soc. London, 423, Bartlett coll.; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 674, Peruvian Amazon; 
Steindachner, 1882 (1883), Denksch. KIk. Akad. Wiss. Wien, LXVI, 4, four specimens 
150-230 mm., Rio Huallaga; 
Eigenmann and Kigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 213; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 392; 
Regan, 1913, Ann. Mag. Nat. Hist., (8), XII, 281, Rio Ucayali; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., XCI, 225, Contamana. 
La Plata drainage to the Magdalena 
15766, 1, 177 mm., creek, Yurimaguas, Allen, October, 1920. 
15767, 3, 230-254 mm., Rio Paranapura, Yurimaguas, Allen, October, 1920. 
15768, 2, 172 and 177 mm., Rio Ucayali, Contamana, Allen, July, 1920. 
15769, 2, 260 and 280 mm., Rio Ucayali, near Orellana, Allen, August, 1920. 
15770, 3, 139-145 mm., Lago Cashiboya, Allen, August, 1920. 
15771, 1, 214 mm., Rio Pachitea, Allen, July, 1920. 
15773, 1, , Mouth of Rio Pacaya, Allen, September, 1920. 
15955, 1, 167 mm., Iquitos, Morris, 1922. 
Steindachner reports a native name chullu-coclla for this species. 
Genus 23: PLATYSTOMATICHTHYS Bleeker 
Platystoma Kner (part), 1857, Sitzb. KKK. Akad. Wiss. Wien, X XVI, 395, fig. 9, sp. 
Platystomatichthys Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 98; 
Eigenmann and Eigenmann, 1890, Oce. Papers Cal. Acad. Sei., 1, 217; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 392. 
Type: Platystoma sturio Kner 
Range that of the unique species 
The most extreme of the genera having elongated and flattened snouts, differing 
from Sorubim mainly in the much greater emphasis of this character, the mouth 
being 1.5 in the greatest width of the head; teeth of upper jaw in an arrow-shaped 
patch; palatine patches ovate longitudinally, and widely separated from the vo- 
merine patch; maxillary barbels wiry or ossified more than half their length and ex- 
