SOUTH AMERICAN NEMATOGNATHI. 409 



353, Plecostomus biseriatus, 



Plecostomus biseriatus Cope, Proc. Acad. Nat. Sci. Philad. 285, pi. 16, 



1871 (Amazon). 

 Habitat: Amazon. 



354, Plecostomus seminudus, 



Plecostomus seminudus Eigenm. & Eigenni. Proc. Cal. Acad. 2d Ser. 



i, 169, 1888 (? Brazil). 

 Habitat: Brazil. 



355, Plecostomus aimae. . 



Plecostomus annce Steindachner, Flussfische Siidamerika's ii 



iii, fig. 2, 1881 (Para). j-..^ 



Habitat: Para. ff ff fo ^ O^ 



356, Plecostomus pantherinus, 



Hypostomus pantherinus Kner, Hypostomiden, 267, 1853 (Jlio Gna- 



pore). 

 Plecostomus pantherinus Giinther, Cat. Fish. Brit. Mus. v, 231, 1864 



(copied). 

 Habitat: Kio Guapore. 



357, Plecostomus cordovae, 



Plecostomus cordovce Giinther, Ann. Nat. Hist. (5) vi, 11, 1880 (Cor- 

 dova). 

 Habitat: Central portion of the Argentine Eepublic. 



This species is known only from the types in the 

 British Museum. 



358, Plecostomus lima, 



Plecostomus lima (Reinhardt MS.) Liitken, Overs. Dan. Selsk. 1873, 

 No. 3, 70 (Rio das Velhas); id. Velhas Flodens Fiske 141, 1875 

 (Rio das Velhas). 



Habitat: Rio San Francisco and its tributaries; Rio Grande do Sul. 



We have examined 5 specimens of this species .16-.40 

 m. Rio San Francisco; Rio das Velhas and Rio Grande 

 do Sui. 



Body short and heavy, its depth If in its width. Head 

 somewhat longer than broad, its upper surface flattish. 

 None of the plates keeled; posthumeral ridge prominent 

 on the anterior 5 scutes. Tail stout, compressed, flat on 

 upper and lower surfaces. Breast and belly, except a 

 narrow area around the ventrals, covered with large 

 scutes. 



