1906. 



NATURAL SCIENCES OF PHILADELPHIA. 



341 



Astyanax pectinatus (Cope). Fig. 29. 



Tetragonopf.erus pectinatus Cope, Proc. Amer. Philos. Soc. Phila., XI, 1869-70 

 (August 19, 1870), p. 560. No. 8,090, A. N. S. P., type. Pebas, Equador. 

 John HauxweU. 



Gill-opening extending forward about anterior third of orbit. 



Rakers about 6 + 9, slender, lanceolate, and less than filaments which 



are about half of orbit. Isthmus narrow and compressed. Scales 



Fig. 29. — Astyanax pectinatus (Cope). 



without striae. Color in alcohol with fins and body nearly uniform 

 brownish, former paler. Body more or less washed with silvery. Iris 

 brassy-brown. Traces of a humeral blotch, though indistinct. Length 

 If inches (caudal damaged). 



Astyanax longior (Cope). Fig. 30. 



Tefragonopterus longior Cope, Proc. Amer. Philos. Soc. Phila., XVII, 1877-78 

 (May 17, 1878), p. 691. Nos. 21,222 (type) and 21,223, A. N. S. P., 

 cotypes. Moyabaraba. Prof. J. Orton. Coll. 1874. 



Predorsal region with a median obsolete keel and postventral region 

 apparently trenchant, edges of body otherwise rounded. Gill-opening 

 forward till about opposite front of eye. Rakers 9 + 11, lanceolate, 

 and longest about f of filaments, which are f of orbit. Isthmus nar- 

 rowly triangular. Each scale with several radiating striae. Color in 

 alcohol faded dull brownish, and back darker than silvered sides. A 

 broad silver line, separating color of back from that of lower surface, 

 extending from shoulder to base of caudal. Humeral blotch rounded 

 23 



