THE AMERICAN TETRAGONOPTERINAE. 303 



Depth 2.4-2.6. Gill-rakers 9.15. 



There are no interpolated scales below the lateral line and the series are 

 therefore not deflected toward the anal. 



Margin of the anal and caudal and middle rays of the latter are dark, the 

 dorsal largely speckled. There is either no milk-white tip to the anal or this spot, 

 when it is rarely indicated is much smaller than in specimens from the Parahyba. 



49. AsTYANAX FASCiATUS HETERXJRUS Eigeumann. 

 Plate 89, fig. 3. 



Astyanax helerurus Eigenmann, Indiana univ. studies, 1914, no. 19, p. 11. 



Habitat. — Truando River. 



Two specimens 5392 C. Type about 50 mm. and 13085 I. paratype about 

 46 mm. Truando. Wilson. 



Head 3.25; depth 3.25; eye 2.75 in the head, about equal to the interorbital. 



Origin of dorsal equidistant from tip of snout and base of middle caudal 

 rays; pectorals about equal to head without opercle, reaching past origin of 

 ventrals; ventrals slightly beyond origin of anal; anal falcate, its highest ray 

 reaching to the last fourth or fifth of the base of the fin. 



A vertically elongate humeral spot; a small round spot on the end of the 

 caudal peduncle; color of caudal unique for the genus. Middle caudal rays 

 black to near then- base, margins of the fin black, the lower wider and more 

 conspicuous and connected with the black of the middle caudal rays by a short 

 black bar across the base of the lower lobe. 



This species, evidently very closely related to A.fasciatus, is readily distin- 

 guished by the peculiar color of the caudal. 



50. Astyanax fasciatus parahybae Eigenmann. 

 Plate 46, fig. 7. 



Astyanax fasciatus parahybae Eigenmann, Bull. M. C. Z., 1908, 52, p. 97; Rept. Princeton univ. exped. 

 Patagonia, 1910, 3, p. 433. 



Habitat. — Parahyba, eastern Brazil. 



