504 CLASS AVES. » 



Yelloiv Green Parrot. P. Xanthopterifjius. Spix. 

 34. f. 1, 2. 



Yellowish green ; middle wing-coverts, yellow ; lower 

 part of the back, green. Brazils. 



Gregarious Parrot. P. Gregarius. Spix. 34. f. 3, 4. 



Herb-like green ; wing, green, spotless ; bill, streaked ; 

 tail rather longer than the wings ; head of female, 

 yellowish. Brazils. 



All these differences of colour and size can 

 scarcely authorize generic distinctions. 



There are left only 



The Parrots with a trunks of Vaill., which have 

 characters sufficiently peculiar by which they may 

 be detached from the others. 



Their short and square tail and crest, composed 

 of long and narrow feathers, assimilate them to the 

 cockatoos. They have the cheeks naked like the 

 aras ; but their bill, with an enormous upper mandi- 

 ble, and the lower very short, which cannot, there- 

 fore, be entirely closed, — their cylindi'ical tongue, — 

 terminated by a little corneous gland cleft at the 

 end, and capable of being protruded out of the 

 mouth — their legs naked a little above the talons- 

 their tarsi short and flat, on which they frequently 

 support themselves in walking — distinguish them 

 from all other parrots. We know but two species, 

 originally from India. 



