232 



THE AMERICAN CHARACIDAE. 



z. Dorsal and ventrals in the male not fila- 

 mentous; origin of the anal in the male 

 nearer the base of the last anal ray than 

 ' to the origin of the dorsal; anal rays 



37^2; 



A. Depth 1.6-2.2 27. atratoensis Eigcnmann. 



AA. Depth 2.33-3 28. caucanus (Steindachner). 



, zz. First dorsal and outer ventral rays filiform 



• in the male; origin of anal nearer origin 



of dorsal than base of last anal ray in the 



^ male; depth in the male 3, in the female 



2.5; A. 38 or 39; lateral line 38 or 39. 



29. filifenis (Eigenmann). 



1. ASTYANAX (POECILURICHTHYS) ERYTHROPTERUS (Holmberg). 



Tetragonopterus erythropterus Holmberg, Revista Arg. nat. hist., 1891, 1, p. 189 (Parand; Buenos 



Aires). 

 Astyanax erythropterus Eigenmajjn, Rept. Princeton univ. cxpod. Patagonia, 1910, 3, p. 432. 



Habitat. — Parana; Buenos Aires. 



Known only from the types. 



Head 3.6; depth 2.63; D. 11; A. 45; scales 12-55-11; eye .66 hi snout, 

 .8-.83 in interorbital. 



Profile concave over posterior part of eye, rising in a curve to the dorsal; 

 ventral profile a curve to origin of anal, rising obliquely along entire base of anal. 



"Blanco plateado, por arriba un poco amariUento y algo verdaso, salpicado de fina y diminuta 

 irroracion negra que se sique las oblicuidades de las lineas intermuscalares; tales puntos se hallan mas 

 espareidos en los radios. Ojo auricdlceo; aletas pares claras, impares de un rojo vivisimo, casi vermel- 

 lon." Holmberg. 



2. Astyanax (Poecilurichthys) alleni (Eigenmann and McAtee). 



Plate 32, fig. 3. 



Tetragonopterus alleni Eigenmann & McAtee, Ann. Carnegie mus., 1907, 4, p. 127, pi. 40, fig. 2 (Cor- 



umba; Rio Otuquis; Asuncion). 

 Ctcnobrycon alleni Eigenmann, Rept. Princeton univ. expcd. Patagonia, 1910, 3, p. 435. 



Habitat. — Paraguay Basin. 



