212 THE AMERICAN CHARACIDAE. 



Cyprinodontoid. Ventral surfaces rounded, the scales rather small, no 

 distinct median series; about 12 scales in front of the dorsal, in a nearly regular 

 series; interorbital but slightly convex, mouth very small, the maxillary very 

 oblique, usually not quite equal to the eye; maxillary-premaxillary border 

 three in the head; second suborbital sometimes covering the entire cheek, 

 usually leaving a naked border behind and a naked triangle under its anterior 

 angle ; premaxillary with three to five teeth in the outer series ; maxillary with 

 one (sometimes none or two?) 5-pointed tooth; mandible with four gradu- 

 ated large teeth and two to five small ones on the sides. 



Gill-rakers 11 +15. 



Dorsal a little nearer caudal than snout, its margin rounded; caudal lobes 

 short, about equal to length of head; depth of caudal peduncle less than its 

 length; anterior rays of anal the longer, the margin very slightly emarginate, 

 its origin on the vertical from or behind the vertical from the base of the last 

 dorsal ray; ventrals not reaching anal; pectorals short, rounded, about equal 

 to head less snout and half the eye, not reaching ventrals by about three scales. 



Scales regularly imbricate; no interpolated rows below the lateral line; 

 caudal naked, a basal sheath of one row of scales along the anterior part of the 

 entire anal; a small axillary scale. 



Sides of head and body thickly covered with chromatophores ; a wedge- 

 shaped humeral spot crossing the third to fifth scale of the lateral line ; a narrow 

 black (in formaline) band from upper angle of gill-opening to end of middle 

 caudal rays. 



Anal tubercles in male scarcely evident. 



30. Hyphessobrycon bellottii (Steindachner) . 

 Plate 79, fig. 8. 



Telragonoplerus bellottii Steindachner, Flussf. .Sudamer., 1882, 4, p. 34 (Tabatinga); Eigenmann & 

 Eigeimiann, Proc. U. S. N. M., 1891, 14, p. 53; Ulrey, Ann. N. Y. acad. sci., 1895, 8, p. 286 (San- 

 tarem). 



Hemigrammus bellottii Eigenmann & Ogle, Proc. U. S. N. M., 1907, 33, p. 14. 



Hyphessobrycon bellottii Eigenmann, Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 437. 



Habitat. — Amazons. 



Specimens examined. 



