352 PROCEEDINGS OF THE NATIONAL MUSEUM *) viomos 
equal distance between midcaudal fin base and pectoral insertion; 
pectoral fins reach to pelvic insertions and pelvics extend to anal origin; 
first branched ray of dorsal and of anal fins usually longest, about 
equal to last simple ray of these fins; first two rays of both paired fins 
about equal and longer than others; caudal fin deeply forked; distal 
margin of anal fin concave, that of dorsal a little rounded or truncate; 
usually adult males have small retrorse hooks on first 5 or 6 branched 
anal rays; base of caudal fin normally scaled, without small scales or 
enlarged ones developed out on the caudal fin lobes; gill rakers short, 
conical about 7-++11 to 13; teeth all tricuspid, in two even rows on the 
premaxillary, the outer with 3 or 4 teeth and the inner always with 5 
teeth; maxillary with one tooth; the maxillary bone is rather short, 
oblique, and barely reaches to a vertical through front of eye; maxillary 
from anterior angle to its rear tip about % eye; gill membranes free 
from isthmus; predorsal and prepelvic areas evenly and normally 
scaled; a single row of scales sheathing base of first six branched anal 
rays. 
TABLE 25.—Counts made on Hyphessobrycon sovichthys 
Number of teeth on each 
Number of fin rays sidelor 
Premaxillary 
Dorsal Anal Eo Pectoral : nee 
mner 
Outer row oo 
ii, 9 | iii, 15 | iii, 16 | iii, 17 | iii, 18 | iii, 19 | iii, 20 | iii, 21) i,7 |i,11/)i1,12}i1,13| 4 3 5 1 
10 1 5 5 10 9 7 2 6 2 2 2 3 9 12 12 
Number of scales 
Number of gillrakers | RRO Number of pores in lateral 
on first gill arch Before Below Above line 
On sides Graal lateral lateral 
line line 
7+11 7+12 | 7+13 30 | 31 10 4 5 8 9 10 
1 4 1 | 2 6 4 4 4 i 4 2 
| 
Color.—Pale all over, with a wide, prominent black band or streak 
along midaxis from back of head to tip of middle caudal fin rays; tips 
of dorsal and of anal rays with several black pigment cells; a row of 
black pigment cells over each pterygiophore opposite anal fin; back 
with edges of scale pockets pigmented; snout and tip of lower jaw 
pigmented; peritoneum silver ventrally but dorsolaterally blackish. 
Remarks.—Since Kigenmann (Mem. Mus. Comp. Zool., vol. 43, 
pt. 2, 1918) and Kigenmann and Myers (ibid., pt. 5, 1929) revised the 
genus Hyphessobrycon, numerous new species have been described in 
