278 Frerp Museum or Naturat History — Zodétocy, Vor. X. 
the seventh ray of the caudal; dorsal fin with convex margin, inserted 
posteriorly, its origin a little nearer the base of caudal than posterior 
margin of opercle; adipose fin about midway between base of last ray 
of dorsal and base of upper ray of caudal; caudal fin forked, the lower 
lobe the longer, the lower fulcra free, forming a short flat spur at margin 
of the enlarged scale of each side; anal fin rather long, its origin in ad- 
vance of dorsal, midway between anterior margin of eye and base of 
caudal, or somewhat nearer the latter; ventral fins reaching to or past 
origin of anal; pectoral fins long, inserted notably nearer tip of snout 
than original of anal. 
Color pale green above, with a dark vertebral band; sides silvery. 
A faint lateral band present in young, scarcely visible in adult; an in- 
distinct shoulder spot present. Fins reddish yellow; a black spot or 
bar at base of caudal, extended to tips of outer rays of both caudal lobes. 
Numerous specimens of this species, ranging in length from 30 to 60 
mm., were preserved. It is abundant in all streams visited on both 
slopes of Panama, except in the Rio Chame where it is replaced by the 
closely related species, G. intermedius. 
Habitat: Both slopes of Panama. 
28. Gephyrocharax intermedius sp. nov. 
Type No. 8945, F. M. N. H.; length 58 mm.; Rio Chame, 
Panama. 
Head 4 to 4.5; depth 3.1 to 3.55; D. 9 or 10; A. 26 to 31; scales 39 to 
43- 
Body elongate, rather strongly compressed; dorsal profile anteriorly 
straight or slightly concave; ventral outline strongly convex; abdomen 
round in advance of ventrals, keeled from ventrals to vent; head com- 
pressed; snout blunt, 3.7 to 5 in head; eye 2.6 to 3.4; interorbital 2.5 to 3; 
mouth small, strongly oblique; the lower jaw a little in advance of the 
upper; maxillary reaching slightly past anterior margin of eye; second 
suborbital broad, with its lower posterior angle rather sharp, often 
forming almost a right angle; teeth as in preceding species; lateral line 
complete, curved downward anteriorly; scales striate, 18 to 20 in median 
series in advance of dorsal; 5 or 6 complete rows between lateral line 
and base of dorsal; the rows below lateral line abruptly bent downward 
and backward toward the base of anal, 5 scales in vertical series between 
lateral line and base of anterior rays of anal; the last scale on lower lobe 
of caudal much enlarged in males, with a hollow space or pocket under- 
neath, its upper edge attached to the seventh ray of caudal; dorsal fin 
inserted posteriorly, its origin somewhat nearer base of caudal than 
margin of opercle; adipose fin about midway between base of last ray 
