238 THE AMERICAN CHARACIDAE. 



9th scale in front of the dorsal, equidistant from tip of snout and the origin 

 of the last third of the anal. Pectorals reaching about to end of the well- 

 developed axillary scale. 



Lateral hue nearly straight; scales with but few widely diverging striae, 

 regularly imbricate except over the anal where a few interpolated rows cause 

 the regular rows to be deflected toward the anal. 



Anal sheath of a single series of scales. 



Dusky above, silvery below; two well-marked vertical humeral spots 

 over the fourth and fifth and over the tenth and twelfth scales of the lateral 

 line, the second spot usually the larger; a silvery lateral band which ends in 

 a dark caudal spot which becomes diffuse on the caudal, never a median caudal 

 band. 



6. AsTYANAX (PoECiLtJRiCHTHYs) RiVETi Pellegrin. 



Plate 40, fig. 3. 



Aslyanax rivcti Pellegrin, Bull. Mus. hist, nat., 1907, 13, p. 25 (Rio Pove); Eigenmann, Rept. Prince- 

 ton univ. exped. Patagonia, 1910, 3, p. 432. 

 Tetragonopierus {Astijanax) rioeli Pellegrin, Mission Equateur, 1912, 9, B. 7, pi. 1, fig. 1. 



Habitat. — West slope of the high Andes of Ecuador. 



Type, a specimen 80 mm. in the Mus. his. nat. Paris. Rio Pove, Santo 

 Domingo de los Colorados, Ecuador, 560 meters d'altitude. Rivet. 



The account in the key is drawn from the type which I was able to examine 

 through the courtesy of Dr. Pellegrin. In the shape of the mouth this species 

 approaches A. asymmetricus, A. symmetricus, et al. 



It is very probable that this is a synonym of Bryconamericus brevirostris 

 (Giinther). 



7. AsTYANAX (PoECiLURiCHTHYs) ASYMMETRICUS Eigenmann. 



Plate 41, fig. 2. 



A sty anax asymmetricus Eigenmann, Bull. M. C. Z., 1908, 52, p. 94; Rept. Princeton univ. cxpcd. Pata- 

 gonia, 1910, 3, p. 432. 



Habitat. — Tabatinga. 



Specimens examined. 



Size 

 in mm. Locality Collector 



51 Tabatinga Bourget 



40, 45 about Tabatinga Bourget 



