170 FISHES OF WESTERN SOUTH AMERICA 
Genus 65: CALLICHTHYS Linnaeus 
Callichthys Linnaeus, 1754, Amoen. Acad., I, 317; 
Gronow, 1763, Zoophyl., 127; 
Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 294; 
Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 82; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sei., I, 451; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 401; 
Gosline, 1940, Stanford Ichth. Bull., II, 1, 6. 
Cataphractus Bloch. 1794, Ausl. Fische, VIII, 80, preoccupied; 
Lacépéde, 1804, Hist. Nat. Poiss., V, 124; 
Swainson, 1839, Fish. Amph. Rept., II, 304. 
Type: Silurus callichthys Linnaeus 
Trinidad to La Plata basin 
Two pairs of nuchal plates between occiput and dorsal plate; suture between 
coracoid processes extending almost horizontally to the posterior margin of the 
pectoral armature; a large opening between coracoid and clavicle below and in 
front of the pectoral spine; coracoid covered with skin; sides of the head without 
bristles; mental barbels wanting; lower jaw with bands of teeth on the sides, small; 
a naked area along dorsal and ventral surfaces; suborbital bones concealed; dorsal 
spine rudimentary; caudal rounded. 
141. CALLICHTHYS CALLICHTHYS Linnaeus 
Callichthys tamoata Linnaeus, 1754, Mus. Adolphi Fred., 734; 
Bleeker, 1864, Silures de Suriname, 22. 
Silurus callichthys Linnaeus, 1758, Syst. Nat., ed. 10, I, 307, America; 
Linnaeus, 1766, Syst. Nat. ed. 12, I, 506; 
Gmelin, 1788, Syst. Nat., I, 1361. 
Cataphractus callichthis Bloch, 1794, Ausl. Fische, VIII, 86, pl. 377, fig. 1; 
Bloch and Schneider, 1801, Syst. Ichth., 107; 
Lacépéde, 1803, Hist. Nat. Poiss., V, 124. 
Cataphractus callichthys Eigenmann and Eigenmann, 1888, Proc. Cal. Acad. Sei., (2), I, 164. 
Callichthys callichthys Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 452; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 402; 
Higenmann, 1912, Mem. Carnegie Mus., V, 215; 
Gosline, 1940, Stanford Ichth. Bull., II, 1, 6. 
Callichthys asper Giinther, 1864, Cat. Fish. Brit. Mus., V, 226; 
Castelnau, 1855, Anim. Amér. Sud, Poiss., 38; 
Cope, 1871, Proc. Acad. Nat. Sci. Phila., XXIII, 275, Rio Ambyiacu; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 681, Nauta. 
Patagonia to the Guianas and Peruvian Andes 
15711, 6, 68-123 mm., creek, Yurimaguas, Allen, November, 1920. 
16133, 1, 136 mm., Lago Cashiboya, Allen, August, 1920. 
Genus 66: HOPLOSTERNUM Gill 
Callichthys (part) Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 294. 
Hoplosternum Gill, 1858, Ann. Lyc. Nat. Hist. N. Y., VI, 395; 
