286 The South American Gharacinidas 



103. Tetragoiioptei-tis gracilis Keiuhardt. 



Liitken, Overs. Dan. Selsk., No. 3, 133, 1874 (Lagoa Sauta) ; id Velhas- 

 Flodens Fiske, XIV., 218, pi. V. fig. 17, 1875 (Rio das Yelhas) ; Eigenm. & 

 Eigenm., Proc. U. S. Nat. Mus., XIV., 53, 1891. 



Habitat: — Lao;oa Santa: Rio flas Yelhas. 



104. Tetragoiiopterus uaiiiis Eeinhardt. 



Liitken, Over.s. Dan. Selsk. Xo. 3, 133, 1874 (Lago Santa); kt. Vellias- 

 Flodeus Fiske, XIV., 218, pi. V. fig. 17, 1875 (Kio das Velhas); Eigenm. & 

 Eigenm., Proc. U. S. Nat. Mns., XIV., 54, 1891. 



Habitat: — Lagq Santa ; Rio das Yelhas. 



105. Tetragoiiopterus liellottii Steindachuer. 



Flnssfisclie Siidamerika's, IV., 34, 1882 (Tabatinga); Eigenm. & Eigenm., 

 Proc. U. S. Nat. Mus., XIV., 53, 1891. 



Habitat :—Tahixtinga • Santarem. Twenty-one specimens from 

 Santarem. 



106. Tetragoiiopterus scliiiiardae Steindachner. 



Flnssfisclie Siidamerilai's, IV., 37, pi. VII., fig. 6, 1882 (Tabatinga); 

 Eigenm. & Eigenm., Proc. U. S. Nat. Mus., XIV., 54, 1891. 



Habitat: — Tabatinga; Para; Brazil. 



Three specimens from the lower Amazons, seven from Para 

 and eleven are marked Brazil. About fifteen scales of the lateral 

 line are perforated. A darker line of the diffuse caudal spot ex- 

 tends to the end of some of the rays, the very evident humeral spot 

 bordered above hy the anterior end of an indistinct silvery lateral 

 band. 



107. Tetragoiiopterus ocellifer Steindachner. 



Flussfische Siidamerika's, IV., 32, pi. VII., fig. 5, 1882 (Villa Bella; C\ida- 

 jas); Eigenm. & Eigenm., Proe. U. S. Nat. Mns., XIV., 54, 1891. 



Habitat: — Yilla Bella; Cudajas. 



108. Tetragoiiopterus robustuliis Cope. 



Hcinifint minus rohuf'tiilns Cope, Proc. Amer. Philos. Soc, 561, 1870 (Petas); 

 id., Proc. Amer. Philos. Soc, 690, 1878 (Peruvian Amazon). 



Habitat: — Petas; Peruvian Amazon. 



} 



109. Tetragoiiopterus lieterorlial>€lus sp. nov. 



Related to sctiiiKirdir. 



Body moderately elongate, tapering rapidly from the i)Osterior end of the 

 dor.sal and anterior of the anal to the base of the ratlier slender caudal pedun- 

 cle. Dorsal inserted al)out midway Ix'tween tlie tij) uf the snout and base of 



