Dec. 28, 1916. FisHes or PANAMA— MEEK AND HILDEBRAND. 323 
ideas chic ccna: tas MAME Milere: dain pointed, in: bande in 
the jaws, the outer ones slightly enlarged; scales moderate, cycloid, ex- 
tending to tip of snout and on base of caudal; caudal peduncle strongly 
compressed, its least depth 1.5 to 1.8 in head; origin of dorsal in female 
over base of last ray of anal, and about midway between posterior 
margin of eye and base of caudal; in the male the origin of the dorsal is 
about midway between tip of snout and base of caudal; caudal rather 
pointed; anal fin in female inserted considerably nearer end of snout 
than tip of caudal, its posterior margin convex; origin of anal in adult 
male is about half as far from end of snout as from tip of caudal, the 
produced portion failing to reach base of caudal by about the length 
of post-orbital part of head, its length 2 to 2.25 in body, the anterior 
branch of the second produced ray the longest, directed forward at 
apex, the first produced ray a little longer than the third, no spur; 
ventral fins reaching to or slightly past vent in female, and notably 
past origin of anal in male; pectoral fins reaching at least to middle 
of ventrals, 1 to 1.4 in head. 
Color of the sexes similar, grayish green; posterior part of body 
with 4 or 5 indistinct, dark cross-bars; a dark line from anal to base of 
= 
FiG. 8. DISTAL PART OF INTROMITTENT ORGAN OF Priapichthys panamensis sp. nov. 
(Greatly magnified.) 
caudal; dorsal fin with dark chromatophores at base of the posterior rays 
and again at the tips of these rays; usually with a more or less distinct 
dark area about vent. 
Of this species we have 37 specimens. The largest female is 37 
and the largest male 24 mm. in length. One specimen is from the Rio 
Chame and all the others from a brackish pool at Chame Point on the 
Pacific coast. 
In general appearance this fish resembles Priapichthys tridentiger, 
but the intromittent organ of the male is quite different, the caudal fin 
is more pointed and bears more scales on its base, the color is paler, and 
the cross-bars are fewer. 
Type a male 24 mm. in length, from Chame Point. 
