Collected by Charles Frederick Hartt. 283 



93. Tetragoiiopterus santareiiiensis sp. nov. 



Boch' moderately elongate, the caudal peduncle rather slender. Head ol, 

 depth 3j in the body. The origin of the doi'sal fin is just behind the base of 

 the ventials. The anterior dorsal and anal I'ays elongate. Tlie pectoral reaches 

 a little beyond the origin of the ventral, the ventral extends sonie-\vhat beyond 

 the front margin of the anal. Caudal deeply lolied. 



Snout short, 4 in the head : diameter of the eye somewhat more than the 

 Avidtli of the interorbital and 2h in the head. The maxillary with no teeth 

 extends to a vertical line touching the anterior margin of the piipil of the eye. 

 Tliejiumeral spot and lateral band are much as in hdlottii, the caudal spot is 

 somewhat more rhomboidal and extends to the end of some of the rays in all 

 of the specimens. Tlie posterior part of the caiidal spot is darker than the 

 anterior. The edges of the scales, especially a])ove tlie lateral line, are marked 

 ^itli a deeper brown color, giving the sides of the body a reticulate appeaiance. 

 A faint line on either side of the dorsal has also this color and extends back- 

 ward and forward. A similar line along either side of the anal. There are 

 faint blotches on some of the anal and dorsal rays. 



D. 10, A. 20-22, scales 5-30-3, lateral line complete. 



Habitat: — Santarem ; ten specimens 22-24 mm. long. 

 Related to cojjei and diaphanus. 



94. Tetragoiiopterus jenynsii Steindachner. 

 Siisswf. Siidiistl. Bras., III., 22, pi. III., fig. 1-2, 1876 (Rio Parahyba); 



Cigenm. & Eigenm., Pr<x-. U. S. Nat. Mus., XIV., 53, 1891. 



Habitat : — Rio Paialiylia. 



, 95. Tetragoiiopterus paucidens sp. nov. 

 Related to (Uaplianus. 



Body rather elongate, dorsal and ^■entral outline nearly equally curved. 



f Dorsal fin equidistant from the tip of the snout and base of the caudal. (Tlie 



ventral fins were destroyed. ) Head 21, depth 24 in the length. Snout 32, 



[diameter of the eye 3 in the head. JNIaxillary Avith two small teeth, extends 



|to a vertical line touching the anterior border of the jivipil. A silvery lateral 



band present and a diffuse caudal spot, no humeral spot. Caudal peduncle 



stout, D. 11, A. 19. Scales 5-31-3, lateral line complete. 



Habitat: — Itaituba. One specimen 45 mm. long. 



96. Tetragoiiopterus fasciatus (Cuvier). 



Ctialeciisfasriattis Cuv., Mem. Mus., V., \>. 352, pi. 26, fig. 2, 1817 ; Schom- 

 burgk. Fish. Brit. Guian., I., 215, 1841 (Paduiri). 



Teiniffono2)teri(s fasciatus Steind., Ichthyol. Not., IX., 8, 1869, fig. 1 (Monte- 

 video); if], Ichthyol. Beitr., Y., 578, pi. I., fig. 3, 1876 ; id, Siiss\\-f. Siidustl. 

 Bras., III., 20, pi. I., fig. 3, 1876 (Rio .Janeiro ; Rio Parahyba ; Rio Jequitin- 

 honha) ; Eigenm. & Eigenm., Proc. U. S. Nat. Mus., XIV., 52, 1891; 

 Eigenm., Ann. N. Y. Acad. Sci., 1894 (Rio Grande do Sul). 



