1906. 



NATURAL SCIENCES OF PHILADELPHIA. 



337 



about 33? in a lateral series to base of caudal; 9? scales between dorsal 

 and ventral; snout 4 in head, measured from tip of upper jaw; eye 2f ; 

 maxillary 2^; interorbital space 3|; least depth of caudal peduncle 3. 

 Maxillary toothless and extending posteriorly a little beyond front 

 rim of orbit, not to pupil. Rakers 10 + 16?, long, slender, and longest 

 nearly as long as longest filaments. Scales large, mostl}^ all fallen, and 

 in alcohol leaving a narrow silvery band broadening out on posterior 

 ■| of its course till about equal to diameter of pupil. No evidence of 

 humeral or caudal blotches. Median caudal rays dusky, also tips of 

 upper and lower lobes. Length If inches. This example was received 

 from Cope, and is most likely the one referred to above. 



Astyanax ipanquianus (Cope). Fig. 25. 



Tetragonoptenis ipanquianus Cope, Proc. Amer. Philos. Soc. Phila., XVII, 

 1S77-78 (May 4, 1878). p. 44. Nos. 21,114 (tjiae) and 21,115, A. N. S. P., 

 cotypes. The upper waters of the Urubamba, one of the sources of the 

 Ucayale. Prof. J. Orton. Coll. of 1876-77. Cope, I.e., p. 692. Uru- 

 bamba River; elevation 11,500 feet. Prof. J. Orton. 



Fig. 25. — Astyanax ipanquianus (Cope). 



Body compressed, and edges rounded. Snout convex. Rami of 

 mandible not elevated inside mouth. Lips thin. Tongue fleshy, 

 broad, rounded in front and hardly free from floor of mouth. Inter- 

 orbital space convex. Gill-opening extending forward about opposite 

 anterior nostril. Rakers 9 + 11, lanceolate, short, and longest a 

 little less than half length of longest filaments. Filaments f an eye- 



