250 PROCEEDINGS OF THE ACADEMY OF [Apr., 



Also Nos. 39,333 to 39,336, paratypes, same data. Head 3| to 

 4; depth If to 2; D. iii, 9, i; A. iv,"31, i or iv, 32, i; scales 34 in 

 1. 1. to caudal base and 2 more on latter; 9 scales above 1. 1.; 11 

 scales below 1. 1.; usually 13 predorsal scales, sometimes 14; snout 

 3f to 4 in head; eye 2f to 2f ; maxillary 2| to 2|; interorbital 2| to 

 2|; length 50 to 76 mm. 



Related to Gymnocorymhus thayeri Eigenmann,^'' and agrees as 

 far as the short account allows. The long produced anterior or 

 first branched dorsal ray and dark ventral and anal edges would 

 appear to be distinguishing characters. 



(Nrj;j.a, thread; -rspuv, fin; with reference to the first branched 



dorsal ray.) 



BRYCONIN.^. 



Brycon falcatUS Miiller and Troschel. 



Three examples, 118 to 137 mm. 



Chalceus labrosus Schomburgk is imperfectly described, though 

 likely identical. The figure is less satisfactory. 



Chalceus macrolepidotus Cuvier. 



Two examples, 150 to 157 mm. They differ slightly from Pelle- 



grinina heterolepis Fowler.i"* The latter has shorter pectorals, a 



broader snout, dusky fins, nearly even jaws, pectoral reaches beyond 



ventral origin, and adipose eyelid absent, etc. The erroneous 



locality was doubtless due to the mixing of collections in the Academy 



from West Africa and Surinam or some other part of South America. 



I shall therefore admit the nominal Pellegrinina as identical, following 



Regan. 



STETHAPRIONIN.E. 



Ephippicharax orbicularis (Valenciennes). 



Head 3f to 4; depth 2 to 2f ; D. in, 9, i; A. v, 31, i to v, 33, i; 

 scales 32 to 35 in 1. 1. to caudal base and 2 more on latter; 10 scales 

 above 1. 1.; 10 or 11 scales below 1. 1. to anal origin; 9 predorsal 

 scales forward to hind end of occipital process; snout 3f to 4 in head, 

 measured from upper jaw tip; eye 2| to 2|; maxillary 2| to 2|; 

 interorbital 2f to 2h ; length of three examples 50 to 66 mm. 



CHALCIN.E. 



Chalcinus angulatus (Agassiz). 



Head 3^; depth 2|; D. iii, 8, i; A. in, 26, i; scales 32 in 1. 1. to 

 caudal base, and 3 more on latter; 6 scales above 1. 1.; 2 scales 



1^ Bull. Mus. Comp. ZouL, 190S, p. 9.3. Amazons, from Tabatinga to Gurupa. 

 " Proc. Acad. Nat. Sci. Phila., 1906, p. 442, fig. 39. 



