210 CHALCEUS T^NIATUS. 



Spix; but that differs in the contrasted angular 

 outline, the direction of the lateral line, and the 

 comparative length of the pectoral fins. The first is 

 from the rivers of Southern Brazil : the second was 

 taken in January in the river Padauiri. The size is 

 stated to be from six to seven inches in length (that 

 of the drawing). " The scales are smooth and 

 elliptical, very deciduous ; teeth are a single row in 

 each jaw, the tongue round and fleshy, the intes- 

 tines are straio^ht, and the stomach was found filled 

 with cassada which had been left on the river's 

 bank to steep. The air-bag single, as long as the 

 cavity of the abdomen. 



C. rotundatus^ — 

 D. 1 1— P. 1 1— V. 7— A. 26— C. 22_Ribs, 14 pairs— Vert. 36. 



C. angulatus^ Spix, — 



D. 1/1 0_P. 12— V. 7— A. 4/28— C. 5/17/5. 



Our next species is of a larger size, and is more 

 typical in form. 



C. ? TiENiATUs, Blue-banded chalceus. — Ara- 

 WAAK, Caborisi; Warrau, Hua; L. Geral, Ja- 

 tuarana. Schomh. Braicings, No. 3. — " The length 

 is from fifteen to eighteen inches, depth six. It is 

 an inhabitant of the river Essequibo, as well as of 

 the Rios Negro and Branco ; it is esteemed a great 

 luxury, and is taken by the hook, baited with small 

 fish. The body is silvery, with light blue stripes ; 

 head and dorsal fin greenish ; pectoral and ventral 

 fins silvery, the latter tipped with black ; anal fin 

 tipped with blue, greenish yellow in the middle, 



