1906. 



NATURAL SCIENCES OF PHILADELPHIA. 



343 



diameter of eye. Pectoral reaches well beyond base of anal. Color 

 in alcohol nearly plain brassy-brown, back a little darker, and caudal 

 with a brownish streak from base out to ends of median rays. No 

 evidence of a humeral blotch. 



Astyanax cauoanus (Steindachner). 



Head 3f ; depth 2f ; D. ii, 9; A. iv, 42; scales (according to pockets) 

 about 38 in lateral line to base of caudal; pectoral about 1^ in head; 

 ventral If; snout about 4f in head, measiu-ed from tip of upper jaw; 

 eye 3 ; maxillary 3 ; interorbital space 2f ; least depth of caudal peduncle 

 about 3. A few small teeth at base of maxillary inside. Rakers about 

 7 + 12?, and longest about f of longest filaments. In alcohol brown- 

 ish, fins paler than body-color, and a silvery band, widest on supra- 

 costal region, from shoulder to base of caudal where it terminates in a 

 brownish spot. A brownish blotch on shoulder at origin of silvered 

 lateral streak. Iris silvered brownish. Length 2^^ inches. One 

 example from Paramaribo. Dr. Hering. 



Astyanax bartlettii (Gunther). Fig. 3L 



Tetragonopterus bartlettii Cope, Proc. Acad. Nat. Sci. Phila., 1871 (1872), p. 

 260. Ambyiacu River, Equador. John Hauxwell. 



Predorsal region with a median keel, rather ol^tuse, and postventral 





Fig. 31. — Astyanax bartlettii (Gunther) 



