CHARACINIDAE FROM VENEZUELA—SCHULTZ 291 
the darkish lateral band; ground color above purplish brown. Thus 
it must be concluded that the type of the genus Parodon is variable 
in color and that several of the species which have been described 
on the basis of black streaks or bands as differing from suborbitale 
need careful study and perhaps they should be placed in the synonymy 
of suborbitale. I especially refer to Parodon bifasciatus Eigenmann, 
P. buckleyi Boulenger, and P. carrikeri Fowler. Probably there are 
others. 
Much of the confusion in separation of the species of Parodon has 
resulted in the almost complete lack of comparative material from 
the Maracaibo Basin since Cuvier and Valenciennes’s time until now. 
Genus HEMIODUS Miller 
Hemiodus MtuuER, Monatsb. Akad. Wiss. Berlin, 1842, p. 324. (Type, Hemiodus 
crenidens Miiller=Salmo unimaculatus Bloch.) (Ref. copied.) 
HEMIODUS IMMACULATUS Kner 
Hemiodus immaculatus Kner, Denkschr. Akad. Wiss. Wien, vol. 17, p. 157, pl. 5, 
fig. 9, 1859 (Barra do Rio Negro).—STEINDACHNER, Denkschr. Akad. Wiss. 
Wien, vol. 41, p. 158, 1879 (Ciudad Bolfvar).—E1GENMANN and EIGENMANN, 
Proc. U. 8. Nat. Mus., vol. 14, p. 49, 1891 (Orinoco). 
No black lateral spot but a dark band along each caudal lobe; 
upper jaw with 22 teeth in horseshoe-shaped row; dorsal rays u, 9; 
anal ii, 10; pelvic i, 11; pectoral i, 17; scales 10 or 11+-70 to 72+6 or 7. 
Genus PIABUCINA Valenciennes 
Piabucina VALENCIENNES, 7n Cuvier and Valenciennes, Histoire naturelle des 
poissons, vol. 22, p. 161, 1849. (Type, Piabucina erythrinoides Valenciennes.) 
In the absence of specimens of Piabucina from the rivers draining 
the western slopes of Lago Maracaibo Basin, it appears necessary to 
recognize two species, the first described by Valenciennes in 1849 and 
the second by Regan in 1903. I regret that I was unable to collect 
Piabucina in the streams flowing down from the Perij4 region, the 
type locality of P. erythrinoides Valenciennes. 
KEY TO THE SPECIES OF PIABUCINA REPORTED FROM VENEZUELA 
la. Scales 37; 9 scales between pelvic insertion and base of dorsal fin; dorsal rays 
10; anal 12; pectoral 16; pelvic 8; origin of dorsal equal distance between 
base of caudal and tip of snout; depth 5, head 4% in standard length; 
black caudal spot not round, its greatest length through vertical axis (after 
Valenciennes) yin 2 ee Piabucina erythrinoides Valenciennes 
1b. Scales 30 to 82, 7% scales from insertion of pelvics to base of dorsal fin; 
dorsal rays usually ii, 8; anal ii, 8 or ii, 9; pectoral i, 13, pelvic i, 7; origin 
of dorsal equal distance between base of caudal fin and eye; depth 4 to 4%, 
head 4 to 4% in standard length; black caudal spot nearly round; dorsal 
fin with the black spot at base between first four branched rays of dorsal. 
} Piabucina pleurotaenia Regan 
