284 Fretp Museum or Naturat History — Zoétocy, Vor. X.. 
Color silvery; sides with a plumbeous lateral band, ending in a 
large, black, caudal spot, which is slightly longer than deep and extended 
only slightly on base of caudal. An ill-defined shoulder spot present. 
This species is represented in the Panama collection by numerous 
specimens, ranging in length from 45 to 90 mm. It occurs on both 
slopes of Panama, and is always found in company with Astyanax 
ruberrimus, but much less abundant, except in the Rio Tuyra Basin 
where it outnumbers the latter. 
Habitat: Both slopes of Panama. 
32. Bryconamericus cascajalensis sp. nov. 
Type No. 8946, F. M. N. H.; length 92 mm.; Rio Cascajal, Porto 
Bello, Panama. 
Head 3.8 to 4; depth 2.6 to 2.95; D. 10 or 11; A. 26 to 29; scales 40 
to 48. 
Body moderately elongate, compressed; the back elevated; head 
small; snout conical, 3.4 to 4.25 in head; eye 2.6 to 3; interorbital 2.6 to 
3: mouth small; jaws subequal; maxillary reaching to or slightly past 
anterior margin of pupil, a little longer than snout; premaxillary teeth 
in 2 series, the outer series irregular, with 10 teeth, the inner series 
regular, with 8 teeth; maxillary with 2 small teeth near its juncture with 
the premaxillary; lower jaw with 8 strong teeth anteriorly and abrubtly 
smaller ones at sides; gill-rakers short, about 12 on lower limb of first 
arch; lateral line complete, slightly decurved; scales rather small, feebly 
striate, 12 to 15 in advance of dorsal, 12 to 14 between dorsal and 
adipose, 8 longitudinal rows between lateral line and anterior dorsal 
rays; dorsal fin inserted about midway between tip of snout and base of 
caudal; adipose fin only a little more than half as far from base of upper 
caudal ray as base of last dorsal ray; caudal fin forked, the lower lobe 
the larger; anal fin rather long, its origin slightly behind base of last 
dorsal ray, a little nearer origin of pectorals than base of caudal; ventral 
fins reaching to or slightly past vent, inserted a little nearer tip of snout 
than base of last anal ray; pectoral fins reaching nearly or quite to base 
of ventrals, inserted a little nearer base of ventrals than tip of snout. 
Color silvery; the back dark green; sides with a plumbeous band, 
which becomes almost black posteriorly, especially in the males. An 
elongate caudal spot present, somewhat extended on base of caudal 
rays. Breeding males with small bluish tubercles on head and margin 
of scales. An obscure humeral spot present. Fins in breeding males 
with barbs, making them rough to the touch. 
Of this species the present collection contains 38 specimens, ranging 
in length from 60 to95 mm. All were taken a little above tide water in 
