4 ON THE SPECIES OF THE GENUS CHALCINUS. 



1. C. 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. G. 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. C. signatus. The bauds 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. Eio Puty. 



4. C.fuscus. On this form the back is very dark ; the 

 sides have a golden reflection but 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 GUNTHERI UOm Sp. n. 



(7. brachypomus Gthr. 

 D. 11, A. 28, V. 7, L. 1. 34. 

 In this species there are but five scales in a series between 



