286 



THE AMERICAN CHARACIDAE. 



series of the premaxillary, five in the inner; one or two broad tipped maxillary 

 teeth. Mandible with four large teeth and about seven small ones on the side. 



Gill-rakers 7 +11. 



Scales cycloid, with numerous slightly diverging striae, regularly imbricate, 

 except along the anal, where they are a little disarranged. Anal sheath very 

 low, of a single series of scales. Lateral line but little decurved, the row of 

 scales below it parallel with it ; a large axillary scale. 



Origin of dorsal equidistant from tip of snout and caudal or a little nearer 

 the former, its anterior rays 3.4 in the length. Caudal about 3.5 in the length. 

 Anal slightly emarginate, its highest ray equals length of head without snout, 

 its origin behind the vertical from the last dorsal rays. In the young, ventrals 

 reach anal, and pectorals the ventrals which they do not do in the adult. 



A conspicuous black spot occupying the entire width of the caudal peduncle 

 in the young, somewhat narrower in the adult, not continued on the middle rays; 

 a faint vertical humeral spot. Base of dorsal yellow, shading into brick-red; 

 middle of caudal yellow the rest brick-red; base of anal brick-red. 



Several specimens from various places on the San Juan in the British 

 Musemn probably belong to this species. In the absence of material for com- 

 parison, they were not identified with certainty when they were referred to me a 

 few years ago. 



41. AsTYANAX RiBEiRAE Eigeumami. 

 Plate 55, fig. 2. 



Astyanax ribeirae Eigenmann, Ann. Carnegie mus., 1911, 8, p. 177, pi. 8, fig. 2. 



Habitat. — Southeastern Brazil. 



Specimens examined. 



