310 



THE AMERICAN CHARACIDAE. 



Scales fewer, 32-34 in the specimens (21080 and 21079) north of the Para- 

 hyba. 



Origin of ventrals and origin of dorsal, or second scale in front of the dorsal, 

 equidistant from tip of snout; origin of anal and third scale behind the dorsal 

 equidistant from snout. 



A faint, vertical humeral spot ; middle caudal raj^s dark. 



Very closely allied to these is A. eigenmanniorum. 



56. ASTYANAX EIGENMANNIORUM (Cope). 



Plate 48, figs. 1, 2. 



Tetragonopterus eigenmanniorum Cope, Proc. Amer. philos. soc, 1894, 33, p. 89 (Rio Grande do Sul); 



Fowler, Proc. Acad. nat. sci. Phil., 1906, p. 346 (Rio Grande do Sul). 

 Astyanax eigenmanniorum. Eigenmajsin, Rept. Princeton univ. exped. Patagonia, 3, 1910, p. 434. 

 Tetragonopterus mandatus lacuslris Eigenmann, Ann. N. Y. acad. sci., 1894, 7, p. 633 (in part) (Rio 



Grande do Sul). 

 Astyanax fasciatus Eveumann & Kendall, Proc. U. S. N. M., 1906, 31, p. 81 (Rio Primero). 

 Astyanax rutilus Eigenmann & Ogle {non Jenyns), Proc. U. S. N. M., 1907, 33, p. 20 (Tiete, Rio Grande 



do Sul). 



Habitat. — Rio das Velhas, South to Rio Grande do Sul; Sapucay, Para- 

 guay and Cordova, Argentina. 



• To base of caudal. 



2 19, 20, 21, 22, 23, 24, 2.5, 26, number of anal rays. 

 11334151 number of specimens. 

 Scales in four specimens 35, 36, 37, 38. 

 ' Largest specimen. 



* A. -^^, ^, -^^, ^, Teeth 4-4, 3-3, 4-4 in the first row of the premaxiUary of three specimens. 

 ' Depth 2.2-2.5 (2.8 in one), A. ^^, ^^, ^^, "-^. Those with A. 23 and 26 are certainly alike. 



6 A 2_L 2 2 2_3 _24 

 ^- 1 ' 5~> 4 ' 2 • 



' A. 25 in all four. 



8A 28 27 28 29 30 

 ^- 3~' T~> 1"> 1 > "1 • 



Scales -V-, -T-, ¥. ¥• Depth 2.5-2.7. 



