172 MEMOIRS OF THE CARNEGIE MUSEUM 



dorsal spine to above ventral and then back to the middle caudal rays, another light 

 streak above it; snout broad, depressed, the width of the mouth about half the length 

 of the head; posterior nares small; upper jaw considerably projecting; dorsal spine not 



nearly reaching tip of last ray ornatus. 



66. Occipital process narrow at the base, scarcely tapering to the tip; pectoral spine with retrorse 



teeth on the basal half of the posterior margin; without conspicuous markings, the chroma- 



tophores in an area between the ana! and dorsal aggregated along the septa.. heteropleurus. 



aa. Adipose dorsal very long, 2.4-2.6 in the length; caudal lobes produced, twice as long as the head, 



maxillary barbels extending much beyond the tips of the caudal altipinnis. 



47. Pimelodus clarias (Bloch). 



Silurus clarias Bloch, Ausl. Fische, 1795, pi. 35, figs. 1-2 = Silurus clarias Linnaeus 

 in part; not Silurus clarias Hasselquist, which is Synodontis clarias from the Nile. 



Pimelodus clarias Lacepede, Hist. Nat. Poiss., V, 1803, 93 (? 8 dorsal rays); Cas- 

 TELNAU, Anim. Am. Sud, Poiss., 1855, 34 (Crixas; Araguay; Ucayale; Ama- 

 zon). — Steindachner, "Fisch-Fauna Magdalenen-Stromes," 1878, 15 (Mag- 

 dalena River); "Flussfische Siidamerika's," xiv, 1882, 4 (Rio Huallaga). — 

 EiGENMANN and Eigenmann, Proc. Cal. Acad. Sci., (2), I, 1888, 134. — 

 EiGENMANN, Ann. N. Y. Acad. Sci., VII, 1894, 633 (Rio Grande do Sul).— 

 Eigenmann and Norris, Rev. Mus. Paulista, IV, 1900, 353 (Iguape). — Eigen- 

 mann and Kennedy, Proc. Acad. Nat. Sci. Phila., 1903, 499 (Asuncion; Arroyo 

 Trementina). — Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 

 1910, 388. 



Bagrus (Ai'iodes) clarias MIjller and Troschel, in Schomburgk, Reisen, III, 1848, 

 627 (Waini and Barima). 



Ariodes clarias Mijller and Troschel, Horse Ichth., Ill, 1849, 10 (British 

 Guiana).— Kner, SB. Akad. Wiss. Wien, XXVI, 1857, 413. 



Pseudariodes clarias BjjEbk'eb., Nederl. Tijdschr. Dierk., I, 1863, 99 (name only). — ■ 

 LtJTKEN, Vid. Med. Naturhist. For. Kjobenhavn, 1874, 194, 199 (Guiana). 



Silurus callarias Bloch and Schneider, Syst. Ichth., 1801, 379, part. 



Pimelodus niaculatus Lacepede, Hist. Nat. Poiss., V, 1801, 94, 107 (Rio Plata). — 

 Valenciennes, in d'Orbigny, Voy. Am. Mer., \, ii, 1847, pi. 1, figs. 1-3 (La 

 Plata to Mexico, Lake Maracaibo). — Cuvier and Valenciennes, Hist. Nat. 

 Poiss., XV, 1840, 192 (Cayenne; Maracaibo). — Schomburgk, Fishes Brit. 

 Guiana,!, 1841, 175 (Rivers of Guiana generally; Rio Negro; Amazon). — Stein- 

 dachner, "Icthyologische Notizen," vi, 1867, 32 (La Plata) ; ix, 1869, 6 (Monte- 

 video). — Hensel, Archiv fiir Naturg., I, 1870, 69 (Jacuhy). — LtJTKEN, Dan. 

 Vidensk.-Selsk. Skr., (5), XII, 1875, 163, fig. (RiodasVelhas).— Steindachner, 

 "Slisswasserfische Siidosthchen Brasihen," iii, 1876,40 (La Plata; Rio San Fran- 



