ElGENMANN: ThE SERRASALMIN.^t AND MyLIN^. 269 



Scales small; caudal naked; scales of the side extending on base of 

 anal. 



Brassy; a humeral spot almost as large as the eye. Sides in the 

 larger with more or less obscure spots variously distributed. 



36. Metynnis hypsauchen (Miiller & Troschel). 



5731 a. C. M. 134 mm. Manaos, Nov. 16, 1909. Haseman. 



5732 a-d. C. M. 130-177 mm. Santarem, Dec. 15, 1909. Hase- 

 man. 



5733 o.~b- C. M. 70 and 95 mm. Manaos, Nov. 29, 1909. Hase- 

 man. 



5736 a. C. M. 45 mm. Bastos, June 26, 1909. Haseman. 



37. Metynnis maculatus (Kner). 



5734 a. C. M. 84 mm. San Joaquin, Sept. 4, 1909. Haseman. 



5735 a. C. M. 49 mm. Caceres, Paraguay basin, May 24, 1909. 

 Haseman. 



5737 ^""^'- C. M. 50-80 mm. Jauru, Paraguay basin, June 2, 1909. 

 Haseman. 



XII. Genus Myleus Miiller & Troschel. 



38. Myleus pacu Humboldt. 



5749 a. C. M. One female, 255 mm. Manaos, Dec. 4, 1909. Hase- 



FiG. 12. Enlarged teeth of a young specimen of Myleus pacu Humboldt, f- 



