THE AMERICAN TETRAGONOPTERINAE. 



257 



18. ASTYANAX (POECILURICHTHYS) BIMACULATUS VITTATUS (Castelnau). 



Tetragonopterus viltalus Castelnau, Exped. Amer. Sud. Poissons, 1855, p. 66, pi. 33, fig. 3 (Bahia). 

 Tetragonopterus bahiensis Steindachner, Susswf. siidostl. Bra.?., 1876, 3, p. 13 (Bahia); Eigenmann 



and Eigenmann, Proc. U. S. N. M., 1891, 14, p. 52; Ulrey, Ann. N. Y. acad. sci., 1895, 8, p. 281; 



Gilbert, Proc. Wash. acad. sci., 1900, 2, p. 102 (reef at Mamanguape). 



Habitat. — Bahia. 



Specimens examined. 



In a number of specimens examined the anal rays and the lateral line are : — 



These specimens thus grade into those of the Rio San Francisco. 



The only variety of this genus from Bahia that can possibly have been 

 used by Castelnau for his figure of A. vittatus is the one that was later desig- 

 nated as A. bahiensis by Steindachner. It is most nearly related to, and only 

 distinguishable in the aggregate from the A. lacustris of its neighboring stream, 

 the San Francisco. The usual number of anal rays is 27; the usual number of 

 scales 34. 



' One small specimen has a stuttering lateral line. 

 ' Six miles north of Bom Fin at Fazenda Amaratu. 



