282 Fretp Musreum or Natura History — Zodtocy, Vor. X. 
rays; adipose fin about half as far from base of upper caudal ray as from 
base of last dorsal ray; caudal fin forked, the lower lobe the longer; 
anal fin rather long, its origin a little behind base of last dorsal ray, 
slightly nearer base of caudal than base of pectorals, its base notably 
longer than head; ventral fins reaching vent, inserted midway between 
tip of snout and base of last anal ray; pectoral fins usually reaching 
nearly or quite to base of ventrals, inserted midway between tip of 
lower jaw and base of ventrals. 
Color silvery, sides with an ill-defined plumbeous band. A spot or 
short bar at shoulder, occasionally a second faint one an eye’s diameter 
behind the first. Base of caudal with a well defined black oval spot, a 
little longer than deep, only slightly extended on base of caudal rays. 
Fins mostly bright red in life. 
The most abundant species of all the fishes of Panama, occurring 
in large numbers from the lowland waters up to the highest mountain 
streams, on both slopes of Panama. Our collection contains numerous 
specimens, ranging in length from 35 to 110 mm. 
The Pacific slope representatives average somewhat larger in size 
and their average depth is proportionately greater. The average depth 
in length for 38 specimens from various localities on the Pacific slope 
and of various sizes is 2.48. Ina similar series from the Atlantic slope 
the average depth is 2.67. 
Steindachner’s name, fischert, has long been used for this species, but 
his figures strongly indicate that he did not have this species, but 
A. fasciatus, as no caudal spot is indicated. The caudal spot is so 
conspicuous in the present species that it could scarcely have been 
overlooked. There is also nothing in Steindachner’s description that 
indicates that it was not the latter species which he had. . The only 
name that is then available is A. ruberrimus Eigenmann, of which we 
have that author’s specimens from Colombia for comparison and find 
them to be identical with the Panama material. 
Habitat: Both slopes of Panama and both slopes of Colombia. 
23. Genus Bryconamericus Eigenmann. 
Bryconamericus Eigenmann, Ann. Carnegie Mus., IV, 1907, 139 (type 
Bryconamericus exodon Eigenmann). 
Very similar to Astyanax. Lateral line complete; caudal naked; 
second suborbital expanded, in contact with the lower limb of pre- 
opercle, and not leaving a naked triangle below suture between the first 
and second suborbitals. First series of premaxillary teeth more or less 
irregularly placed. 
