108 THE AMERICAN CHARACIDAE. 
Specimens examined. 
Catalogue Number of 
number specimens Size in mm. Locality Collector 
20955 Type 1 50 Lake Hyanuary Navez 
3725 .C. 1 52 Manaos Haseman 
3726 C. 3 about 20-51 Bastos Haseman 
Distinguished by its caudal spot and short anal. Head 4; depth 3.25; 
D. 11; A. 18 or 19; seales 5-33 or 34-3. Eye 3, a little more than interorbital. 
Elongate, compressed; dorsal and ventral profiles gently curved, dorsal 
profile somewhat angulated at the origin of the dorsal, not depressed over eyes. 
Preventral area flattish, with a median series of scales, the lateral scales some- 
what angulated; predorsal area somewhat keeled, with a median series of ten 
scales reaching from the occipital process to the dorsal. 
Occipital process short, reaching about one sixth to dorsal, bordered by 
three scales on each side; interorbital very slightly convex; second suborbital 
leaving a wide naked area; maxillary not reaching end of first suborbital, equal 
to distance from tip of snout to pupil, two and two thirds in the head. 
Four teeth in the front series of the premaxillary, opposite the second 
and third of the inner series, the first distinetly largest; inner series of five or 
six graduated teeth; four large, graduated teeth on each ramus of the lower jaw 
and numerous small ones. 
Gill-rakers about 9 + 15, long and slender, one half as long as eye. 
Scales regularly imbricate, with four to six striae; two and a half scales 
between lateral line and front of anal, apparently no anal sheath; caudal lobes 
with scales for at least half their length; lateral line slightly decurved, the rows 
of scales above and below it parallel with it; a well-developed axillary scale. 
Origin of dorsal about equidistant from tip of snout and base of caudal, 
the ventrals a little nearer tip of snout; highest dorsal ray not quite four in 
the length; anal emarginate, its origin but little more remote from the tip of 
the snout than the end of the dorsal, anal basis a little more than one fourth of 
the length; the adipose fin opposite the end of the anal. Ventrals reaching anal; 
pectorals to ventrals. 
The middle of the first fully developed anal ray of the male provided with a 
large retrorse hook on each side. 
A faint, ill-defined, silvery band, above which is a gray line; middle caudal 
rays jet black, the color spreading out over the base of the fin. Scales and fins 
minutely punctate; sides brassy iridescent. Humeral spot very faint or absent. 
