BLACK-STRIPED CHALCEUS. 213 



green ; the pectoral elongated, but not so much in 

 proportion as that of the preceding fish ; the dorsal 

 placed above the centre of the ventral fin. The anal 

 fin is deeper in general tint, and has a broad black 

 mark running from the centre of its anterior edge 

 for one-third of its length. The tail is of a bluer 

 shade than the other fins, and has a dark bluish 

 black bar running across, parallel to the fork. The 

 colour of the iris is yellow. 



D. 10— P. 12— V. 8— A. 23— C. 24— Ribs, 16 pairs- 

 Vert. 37. 



BLACK-STRIPED CHALCEUS. 



Chalceusl nigro-tcBniatus. 



PLATE XIIL Fig. 2. 

 L. Geral, Waracu. Schomh. Drav:ings^ No. 53. 



This curiously marked fish we have placed in Chal- 

 ceits with a little doubt; it wants the elongated 

 anal fiix, and in form closely resembles a Coregonus. 

 It was a male ; " from fourteen to sixteen inches in 

 length, and was taken with the hook at Pedrero on 

 the Rio Negro. The stomach was filled with cas- 

 sada roots, which had remained on the banks of the 

 river and Avere rotten. The scales were large, ellip- 



