346 PROCEEDINGS OF THE ACADEMY OF [J line » 



series back from origin of dorsal to lateral line; 6 scales from base of 

 ventral in a vertical series to lateral line, sometimes 7, rarely 5, and 

 same between origin of anal and lateral line; 13 to 19 scales before 

 dorsal, usually 15 to 16, less frequently 14 or 17, and rarely 13, 18- or 

 19; eye 2^ to 3^ in head, measured from tip of upper jaw, larger 

 measiu-ements in young; length of specimens ly^g- to 4f inches. 



Astyanax ceneus (Giinther) is a closely related species differing 

 chiefly in the absence of maxillary teeth, according to Dr. Meek's 

 account. The other characters are seen to be more or less correlated, 

 as several of my examples of A. mexicanus which possess as many as 24 

 developed or branched anal rays (would be 26 or 27 evidently according 

 to Dr. ]\Ieek's count) also have well-developed basal maxillary teeth. 



A number of examples, possibly cotypical of Tetragonopterus streetsii 

 Cope, have uncertain data. They are included in the above measure- 

 ments, and are Nos. 32,371 to 32,426, A. N. S. P. 

 Astyanax fasciatus (Cuvier). 



Tetragonopterus fasciatus Cope, Proc. Amer. Philos. Soc. Phila., XI, 1869-70 

 (August 19, 1870), p. 566. Para. Mr. De Schulte Buckow. 



Head 3^; depth 2f ; D. iii, 9; A. iv, 26; scales 34 in lateral Hne to 

 base of caudal, and 3 more on latter; 6 scales in an obliquely vertical 

 series from origin of dorsal to lateral line; 6 scales in a nearly vertical 

 series from origin of ventral to lateral line; 14 scales before dorsal; 

 snout 4 in head, measured from tip of snout ; eye 3 ; interorbital space 2§ ; 

 least depth of caudal peduncle 2J; pectoral 1^ in head, from tip of 

 mandible; ventral If. Several minute maxillary teeth. Rakers 

 about 9 + 15 on first arch, those on ceratobranchial largest, though 

 shorter than filaments. Each scale of body with several striae. Pos- 

 terior distal extremity of maxillary extending back till opposite pupil. 

 Humeral and caudal spots pale. Rather broad pale or silvery band on 

 side of trunk evident. Iris brassy-brown and side of head silvery. 

 Length 2|- inches. One example. 



I accept the above name, as Dr. Giinther pointed out the inconsist- 

 encies of Cuvier's figure and description, also when compared with 

 other accounts. The examples identified by Prof. Ulrey {Ann. N. Y. 

 Acad. Sci., VIII, 1893-95, p. 284) as Tetragonopterus fasciatus (Cuvier), 

 and credited to Dr. Eigenmann, with the developed anal rays 19 to 25, 

 would seem to indicate a rather unusual range of variation. 

 Astyanax eigenmanniorum (Cope). 



Tetragonopterus eigenmanniorum Cope, Proc. Amer. Philos. Soc. Phila., 

 XXXIII, 1894 (January 5), p. 89, PI. 6, fig. 8. Nos. 21,598 (type) to 

 21,602, and 21,627 and 21,628, A. N. S. P., cotypes. BrazUian province 

 of Rio Grande do Sul. H. H. Smith. 



Predorsal region with median keel. Apparently a low keel on each 



