122 FISHES OF WESTERN SOUTH AMERICA 
As in the case of the nearby genera, a tough, leathery, insoluble coat of mucus 
invests these fishes; this remains undiminished after many years in alcohol. The 
flesh tends to soften. 
71. AUCHENIPTERUS BRACHYURUS (Cope) 
Euanemus brachyurus Cope, 1878, Proc. Amer. Phil. Soc., XVII, 676, Peru. 
Auchenipterus brachyurus Eigenmann and Eigenmann, 1888, Proc. Cal. Acad. Sci., (2), I, 152; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 298; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 397. 
Known from the types at Philadelphia. 
Genus 30: PSEUDAUCHENIPTERUS Bleeker 
Pseudauchenipterus Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 88; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 396. 
Felichthys Swainson, 1839, Fish. Amph. Rept., II, 305; 
Swain, 1882, Proc. Acad. Nat. Sci. Phila., 281; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 285. 
Type: Silurus nodosus Bloch 
Lower courses of rivers Atlantic seaboard; Ucayali river 
The genus is characterized by the emarginate anal fin and forked caudal; 
smooth outer margin of pectoral spine, sometimes granular; head longer than wide, 
but lower jaw shorter than upper; mental barbels in two pairs; eye large, lateral, 
covered with skin; palate and vomer edentulous; teeth villiform; bones of head 
thick, covered with skin. 
72. PSEUDAUCHENIPTERUS NODOsUs (Bloch) 
Silurus nodosus Bloch, 1794, Ausl. Fische, viii, 35, pl. 368, fig. 1; 
Bloch and Schneider, 1801, Syst. Ichth., 383. 
Arius nodosus Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 70. 
Auchenipterus nodosus Miller and Troschel, 1849, Horae Ichth., III, 11; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 194. 
Pseudauchenipterus nodosus Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 88; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 396; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., XCI, 231. 
Felichthys nodosus Swain, 1882, Proc. Acad. Nat. Sci. Phila., 281; 
Rigenmann and Figenmann, 1888, Proc. Cal. Acad. Sei., (2), I, 154; 
Eigenmann and EKigenmann, 1890, Occ. Papers Cal. Acad. Scei., I, 290. 
Bahia and British Guiana to Peru 
Fowler’s record of a 145 mm. specimen from Contamana seems to extend the 
known range of the species much farther inland. 
5 
Genus 31: EPAPTERUS Cope 
Epapterus Cope, 1878, Proc. Amer. Phil. Soc., XVII, 677; 
Kigenmann and Higenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 292. 
