CHARACINIDAE FROM VENEZUELA—SCHULTZ 307 
peduncle about equal to its least depth; intestine short, with one main 
loop. 
OColor.—Usually the color in alcohol is pale, with the margins of the 
scales weakly pigmented, but in the collection from the Rio Agua 
Caliente the general color is blackish and the margins of the scales 
blackish; in life these fish had a dark purplish sheen. The humeral 
and caudal spots are blackish and always distinct; the peritoneum 
silvery with several black pigment spots; upper part of head, tips of 
snout, and chin usually with black pigment. 
Remarks.—This new subspecies, dientonito, differs from Roebordes 
day dayi (Steindachner) in having fewer scales along the lateral line as 
indicated in the key on page 303 and in the tables. 
Named dientonito in reference to the small toothlike protuberances 
on the upper lips and partly after the common name of this fish. 
Genus BRYCON Miller and Troschel 
Brycon MUuuER and Troscnen, Arch. Naturg., vol. 10, No. 1, p. 90, 1844. 
(Type, Brycon falcatus Miller and Troschel.) 
TENTATIVE KEY TO THE SPECIES OF BRYCON REPORTED FROM VENEZUELA, BASED 
WHOLLY ON LITERATURE 
la. Scales 54 to 56; anal rays 26; scales above lateral line 10% or 11, below lateral 
line 7; pelvics 9; dorsal ii, 9; depth 3 and head 3 in standard length; inter- 
orbital 3, snout 3% to 4, eye 3% to 3% all in head; humeral spot a little 
larger than pupil; caudal spot elongate, as much on peduncle as on base of 
midcaudal fin rays and not extending to end of caudal rays. 
Brycon longiceps Steindachner 
1b. Scales 44 or 45; anal rays 25 or 26 (iii, 23 or iii, 24); scales above lateral line 8 
and below it 4; pelvic rays i, 7; dorsal ii, 9; depth 3% and head 3 in standard 
length; interorbital 334, eye 4%, snout 33, all in head; humeral spot not 
shown in drawing of type; caudal spot elongate-oval shaped, barely extend- 
Hayes Oa) STOVE KER NIKO EMD abay Teel A Brycon coquenani Steindachner 
BRYCON LONGICEPS Steindachner 
Brycon longiceps STEINDACHNER, Anz. Akad. Wiss. Wien, vol. 16, p. 150, 1879 [no 
locality given]; Denkschr. Akad. Wiss. Wien, vol. 41, p. 156, pl. 1, fig. 5, 1879 
(Ciudad Bolivar, Venezuela).—EI1GENMANN and E1GENMANN, Proc. U. S. 
Nat. Mus., vol. 14, p. 55, 1891 (Orinoco, Ciudad Bolivar). 
BRYCON COQUENANI Steindachner 
Brycon coquenant STEINDACHNER, Denkschr. Akad. Wiss. Wien, vol. 93, p. 37, pl. 
1, figs. 1, 2, 1917 (Rio Coquenan in Venezuela). 
Genus PYRRHULINA Valenciennes © 
Pyrrhulinag VALENCIENNES, 7n Cuvier and Valenciennes, Histoire naturelle des 
poissons, vol. 19, p. 535, 1846. (Type, Pyrrhulina filamentosa Valenciennes.) 
PYRRHULINA FILAMENTOSA Valenciennes 
Pyrrhulina filamentosa VALENCIENNES, in Cuvier and Valenciennes, Histoire 
naturelle des poissons, vol. 19, p. 585, pl. 589, 1846 (Surinam).—Fow.LmEr, 
Proc. Acad. Nat. Sci. Philadelphia, vol. 83, p. 407, 1931 (Pitch Lake at 
Guanoco; Cafio Guanoco, Venezuela). 
