1906.] NATURAL SCIENCES OF PHILADELPHIA. 347 



side of preventral region. Postventral region trenchant and edges of 

 body otherwise rounded. Gill-opening extending forward a little 

 beyond front margin of pupil. Rakers 8 + 10? (damaged), slender, 

 pointed, and shorter than filaments. Isthmus narrow and compressed- 

 A few strige on each scale. Color in alcohol pale brownish, back darker 

 than lower smi ace and traces of a pale or silvery band from eye to base 

 of caudal. An indistinct brownish humeral blotch and another at base 

 of caudal, also extending out on median rays of latter. Fins pale 

 brownish. Eyes silvered. Length 2^^ inches (caudal damaged). 

 Type. 



The other examples all show: Head 3^ to 3^; depth 2f to 2f ; D. iii. 

 9, rarely ii, 8; A. iv, 21, i or iv, 22, i, usually latter; scales 30 to 3-1 

 in lateral line to base of caudal and 2 or 3 on latter ; 6 scales obliquely 

 back from origin of dorsal to lateral line; 5 or 6 scales from origin of 

 ventral to lateral line in a vertical series; 13 to 15 scales before dorsal, 

 usually 14; eye 2f to 2| in head ; total length of examples 2 to 2f inches. 



This form has been united with Astyanax fasciatus (Cuvier) by Prof. 

 Ulrey. The above characters will show that it had at least best be 

 regarded as distinct, if only provisionalh'. Further, it may be stated 

 as differing principally from A. fasciatus in the fewer anal radii. All of 

 the above characters are also constant, and it is possible to separate 

 these specimens from those representing Astyanax laticeps, as Cope 

 rightly determined. I shall therefore be obliged to remove the latter 

 from the synonymy of A. fasciatus, where it has also been placed by 

 Prof. Ulrey, as it differs principally in still fewer anal radii. Thus 

 from an examination of the material before me I shall refuse to con- 

 sider A. eigenmanniorum and A. laticeps either as variations of A. 

 fasciatus or in fact either as the same species. Finally Cope's descrip- 

 tion and figure of A. eigenmanniorum may hardly be styled excellent, 

 much less that it leaves little doubt that the fish in question is simply 

 a variation of T. fasciatus. 

 Astyanax iheringii (Boulenger). 



Tetragonopterus pliodus Cope, Proc. Amer. Philos. Soc. Phila., XXXIII, 

 1894 (January 5), p. 90, PI. 5, fig. 5. Nos. 21,578 (type) and 21,579, 

 A. N. S. P., cotypes. Brazilian pro\ance of Rio Grande do Sul. H. H. 

 Smith. 



Predorsal region with median rounded ridge, and postventral trench- 

 ant, edges of body otherwise rounded. Gill-opening reaching front 

 of pupil. Rakers about 10 + 12, short, lanceolate, and longest about 

 i of longest filaments which are about equal to ^ of vertical orbital 

 diameter. Isthmus triangular and rather broad. Each scale with 

 several radiating strise. Color in alcohol brownish, lower portion of 



