340 



PROCEEDINGS OF THE ACADEMY OF 



[June, 



Aatyanax hauxwellianus (Cope). Fig. 28. 



Tetragonopterus hauxwellianus Cope, Proc. Amer. Philos. Soc. Phila., XI, 

 1869-70 (August 19, 1870), p. 560. Nos. 8,137 (type) to 8,142, A. N. S. 



P., cotypes. Pebas, Equador. John Hauxwell. Cope, I.e., XVII, 



1877-78 (May 17, 1878), p. 691. Peruvian Amazon. Prof. J. Orton. 

 Coll. of 1873. 



Gill-opening extending forward about opposite front of eye. Rakers 

 10? on lower part of first arch. Filaments a little longer than longest 

 rakers. Isthmus compressed and narrow. Color in alcohol faded to 

 dark brown, lower surface paler. Fins all brownish. A dusky blotch 

 at base of caudal and a similar shade in humeral region. Iris brassy. 

 Length 2^^ inches (caudal damaged). Type. 



Fig. 2S. — Astyanax hauxwellianus (Cope). 



flThe other cotypes show: Head 3h to 3§; depth 2 to 2f ; D. usually 

 III, 9, sometimes iii, 8 or iii, 10; A. usually iv, 40?, sometimes iv, 41?; 

 total length 1|| to 2-^-^ inches. The distinct lateral silvery band 

 mentioned by Cope is now hardly e\ddent. 



Also 59 examples from the Orton Coll. of 1873, Peruvian Amazon, 

 and an example from Robert Perkins, from between the mouth of the 

 Rio Negro and the Peruvian Amazon. 



