ON THE SPECIES OF THE GENUS CHALCINUS. 6 
Scales from upper edge of gill-opening to caudal 40-47 ; 
rays in the anal fin 27-32 ; 
first anal ray behind the dorsal . O. elongatus. 
rays in the anal 30-34 ; 
first anal ray beneath middle of dorsal G. culler, 
rays in the anal 35-41 ; 
first anal ray in front of dorsal (7. jnagdalenm 
CHALCINUS ANGULATUS Spix and Ag. ; C. V. 
G. brachipoynus C. V. 
G. mulleri Fil. 
C. Irifurcalus Cast. 
G. nemalwus Kn. 
Triportheus -fiavus Cope. 
Valenciennes states in his description of G. brachipomus 
that the length is about three and a half times the height 
and nearly five times the length of the head, which propor- 
tions, together with the characters assigned it, seem tone- 
cessitate placing it as asynonyme with G. angulatus. G. 
brachypomus of Glinther is so different in essential respects 
from that of Valenciennes that the two cannot be considered 
identical. On typical specuiiens of G. angulatus the labial 
folds and the barbels are short, apparently ; in this and in 
the other species, they are longer in the young than in the 
old, and it may be they are the more developed in the 
spawning season. One of the varieties has a length of barbel 
that equals or exceeds the diameter of the eye. Examina- 
tion of a large number of specimens discloses no variation in 
the number of scales (6) between the first ray of the dorsal 
and the lateral line. Hab. Coary, Cudajas, Fonteboa, 
Hyavary, Iga, Jutahy, Lake Hyanuary, Lake Jose Assu, 
Manacapouru, Manaos, Obydos, Santarem, Silva, Lake Sa- 
raca, Tabatinga, Telfe, Tonantins. 
The species as represented in the collection is separable 
into four varieties beside the type form. 
