214 
AVES. 
arcuated both above and below; upper mandible greatly bent, 
and hooked at the point, and provided with a notch; under 
mandible short and truncated; having a cere at the base of the 
bill; head large ; nostrils roundish, and placed within the cere ; 
legs short, very strong; tarsus shorter than the external toe ; 
the interior toes attached at their base. 
Sub-Genus 1.—Psittacus. — Parrots.—Face covered with 
feathers. 
Psittacus Cyanotus.— The Brazilian Parrot. 
Plate XLVIII. fig. 6. 
Rich yellow-green above, and paler on the under parts, the 
feathers marginated with purple-brown ; cheeks Antwerp-blue ; 
crown yellow; wings edged with red ; quills dull blue; outer 
tail feathers blue, the second red, and the rest green, tipped 
with yellow. Inhabits Brazil. 
Sub- Genus 2. — Plyctolophus. — Vieillot. — Cockatoos.— 
Head with a crest. 
Section 1.— Crest pendulous. 
Psittacus rosaceous. —The Rose-Crested Cockatoo. 
White, with an occasional tinge of rose-colour; crest orange- 
red ; inferior wing and tail-coverts pale sulphur-yellow; bill 
bluish-black’; legs lead-colour. Sixteen to eighteen inches long. 
Inhabits Sumatra. 
Section 2. — Crest turned upwards. 
Psittacus sulphureus. —The Yellow-Crested Cockatoo. 
Plate XLVIII. fig. 8. 
White, crest bright sulphur-yellow; under surface of the 
wings and tail straw-coloured; cheeks occasionally the same; 
bill grayish-black; irides dusky brown. Length fifteen inches. 
Inhabits New Holland. 
Sub- Genus 3.—Macrocercus.— Maccaws.— Vieillot. — Face 
divested of feathers, or occasionally striated with transverse 
feathered lines ; tail long, cuneiform, and acute. 
