472 CROCODILIA chap. X 



tinga of the natives, reaches only six feet in length and has a 

 slender muzzle and a black-banded tail. Another species, C. 

 niger, the Jacar6-nassu or large Caiman, attains an enormous 

 bulk and a length of 20 feet. They migrate annually, retreating 

 to the flooded forests in the wet season and descending to the 

 main rivers in the dry season. 



