4 ON THE SPECIES OF THE GENUS CHALCINUS. 
1. G.curtus.. Distinguished by the shortness of its body 
and the roundness of its outlines, its depth being more 
than one-third of its length, without the caudal. The lo- 
calities indicated are Para and Arary. 
2. C. vittatus. Marked by the possession of two or more 
longitudinal bands on the flank, formed by a spot of dark 
color about the middle of the posterior border of each scale 
in the row. Commonly there is a patch of brown near the 
base of the pectoral. Taken at Jose Fernandez, Villa Bella, 
Porto do Moz, and Santarem. 
3. G. signatus. The bands are absent from the flanks of 
this form ; it is darker on the upper surface than the pre- 
ceding; the fins are darker on their edges, and there is a 
transverse band of light color on the caudal. The flanks 
are silvery. Hab. Rio Puty. 
4. C.fuscus. On this form the back is very dark ; the 
sides have a golden reflectionbut the scales are broadly mar- 
gined with brown on their free edges which makes the fish 
appear dark colored. Top of head, lips and barbels nearly 
or quite black. Fins, brownish. Barbels, as long as the 
eye. From Villa Bella and Lake Hyauuary. 
CHALCINUS PARANENSIS Gthr. 
D. 11, A. 30, L. 1. 32. 
According to the description this species has thirty rays 
in the anal fin, thirty -two or thirty-three scales in the lateral 
line, six scales between the latter and the first ray of the 
dorsal, and the length without the caudal is equal to two 
and two-thirds times the height or four times the length of 
the head. Described from the Parana river. 
CHALCINUS GtJNTHERI UOm sp. n. 
C hracliyi^omus Gthr. 
D. 11, A. 28, V. 7, L. 1. 34. 
In this species there are but five scales in a series between 
