Dec. 28, 1916. FisHes or PANAMA— MEEK AND HILDEBRAND. 273 
first arch; lateral line incomplete, present on 10 to 16 scales; scales thin, 
striate; dorsal fin small, its origin somewhat nearer base of caudal than 
tip of snout; caudal fin naked, its lower lobe the longer; anal fin very 
long, its base greater than half the length of body; ventral fins minute, 
scarcely longer than eye, reaching origin of anal; pectoral fins rather 
long, overlapping ventrals, but not quite reaching the tips of the latter. 
Color translucent, silvery; sides with a dusky band, most distinct 
posteriorly. Scales with chromatophores, which are also present on 
the fins; chin and maxillary black; no caudal spot. 
The present collection contains 12 specimens of this species, ranging 
in length from 35 to 57 mm. ‘These were taken at various points in the 
Rio Tuyra Basin. A comparatively rare species. 
We have for comparison a paratype of P. wilsoni Eigenmann, which 
we find to be identical with the present species. It is noted that in the 
original description of P. wilsoni the scales in the lateral series are given 
as 34 or 35. However, we are able to count 42 in the paratype that is 
at hand. 
Habitat: Rio Tuyra and Rio Atrato basins. 
19. Genus Compsura Eigenmann. 
Compsura Eigenmann, Memoir. Carnegie Mus., VII, 1916, 60 (type 
Compsura heterura Eigenmann). 
Minute fishes, with few teeth; multicuspid incisors, in a single series 
in each jaw, 2 or 3 teeth on maxillary; second suborbital in contact 
with the preopercle below and partly behind; lateral line incomplete; 
FIG. 1. DIAGRAM SHOWING THE PECULIAR SCALING AT BASE OF CAUDAL FIN 
\OF THE MALE OF Compsura gorgone (Evermann & Goldsborough). 
scales thin, with a few radiating strie; the male with a peculiar lobe of 
enlarged scales on lower half of base of caudal; origin of dorsal about 
equidistant from snout and base of caudal; adipose fin well developed; 
interhemal spines of caudal peduncle not projecting; a conspicuous 
caudal spot present. 
