THE AMERICAN TETRAGONOPTERINAE. 



309 



AMyanax taeniatiis Eigenmann, Kept. Princeton univ. exped. Patagonia, 1910, 3, p. 434. 

 Tetragonoptcrus fasciatus Steindachner (?io?j Cuvier), Siisswf. sildostl. Bras., 1876, 3, p. 20, pi. 1, fig. 3, 



in part (Rio de Janeiro; Rio Parahyba; Rio Jequitinhonha); Eigenmann & Eigenmann, Proc. 



U. S. N. M., 1891, 14, p. 52; Ulrey, Ann. N. Y. acad. sci., 1895, 8, p. 283. 



Habitat. — Costal streams from Bahia to Santos and Rio das Velhas. 



Specimens examined. 



Jenyns described two small fishes ' ' evidently distinct from either of the last 

 two species, A. fasciatus and A. scabripinnis the characters of which are in some 

 measures combined in them." 



He gives the scales as 7-40-6; A. 3/22; general form of A. fasciatus; four- 

 teen or more teeth in the lower jaw; ventrals in exact line with the origin of the 

 dorsal; depth 3 to base of caudal fork. 



I have a number of specimens that evidently belong to this species. The 

 scales are, however, never more than 39 in the lateral line, while the ventrals in a 

 few specimens are immediately below the origin of the dorsal; they are in front 

 of the dorsal in most cases. They are identical with Steindachner's A . fasciatus 

 which is not the A . fasciatus of Cuvier. 



Head 4.2-4.3; depth 2.5-2.33; D. 11; A. 21-24', rarely 19 or 20; scales 

 5 or 7-32 to 39-4 or 5; eye 3-3.25 in the head; interorbital 2.5-3. 



Premaxillary teeth three in the front row and five in the back; two maxil- 

 lary teeth. Dentary teeth not abruptly smaller on the sides, more graduate, 

 approaching Deuterodon. 



Gill-rakers 8 -|- 13. 



' To base of caudal. 



24 22 23 24 25 28 28 

 ^- 1 1 ~S"' 1 1 ^> ^' "1 • 



' Of the specimens mentioned above 20880 has but 19 anal rays, 20889 has depth 2.25. 



