1906.] 



NATURAL SCIENCES OF PHILADELPHIA. 



439 



/f- 



Fig. 37. — Astyanax oligolepis (Giinther). 



Astyanax abramis (Jenyns). 



Tetragonopterus sp. indet. Cope, Proc. Amer. Philos. Soc. Phila., XVII, 

 1877-78 (May 17, 1878), p. 691. Peru\'ian Amazon. Prof. J. Orton. 



Head 3 to 31- ; depth 2f to 3 ; D. in, 9 ; A. iv, 24? (usually more) to 30 ; 

 scales about 44 to 48 (according to pockets) in lateral line to base of 

 caudal and usually 3 more on latter; 19 to 21 scales before dorsal, the 

 usual number 19 or 20; 10 to 12 scales in an oblique series back from 

 origin of dorsal to lateral line; about 7? to 9 scales in a vertical series 

 from origin of anal to lateral line; eye 2| to 3^ in head, measured from 

 tip of upper jaw; length of specimens (caudals damaged) 2| to 3^ 

 inches. A tooth at base of maxillary. Coll. of 1873. A series of 25 

 poorly preserved examples. 



The larger examples are deeper and have the anal beginning a little 

 before bases of last dorsal rays. Pectoral reaching a little beyond 

 origin of ventral, and latter reaches that of anal. Caudal and humeral 

 blotches evident in alcohol. Pectoral and ventral blackish, and anal 

 also finely specked with dusky. 



Although certain minor discrepancies may be noted between 

 Jenyns' figure and these examples I believe they are identical. Jenyns 



