THE BLUE AND YELLOW MACAW. 
MACROCERCUS ARARAUNA. VIEILL. 
Tue genus Macrocercus is characterized by the robust- 
ness of its beak, which is extremely broad and powerful ; 
by the nakedness of its face, which is sometimes entirely 
bare, and sometimes partially covered with lines of short 
and scattered feathers; and by the size and form of its 
tail, which is longer than the body, regularly graduated, 
and terminating in an acute apex. ‘The whole of the 
species are American, and are remarkable for the bril- 
liancy of their colours, which are perhaps more varied 
and more gaudy than those of any of the other modern 
divisions of the Linnean genus Psittacus. They are 
consequently more sought after as objects of luxury and 
