236 
AVES. 
Tetrao itrogallus. — The Cock of the Woods. 
Plate LVI. fig. 3. 
Head and neck with transverse lines of black and gray; up¬ 
per parts dusky, transversely waved with ash-colour; throat 
black, waved; axilla white ; breast with iridescent-green reflec¬ 
tions, tail black, rounded; bill white. Two feet ten inches 
long. Inhabits Norway and Sweden. 
Section 2. —With tarsus and toes feathered ; tail square at 
the end. 
Tetrao lagopus. — The Ptarmigan. 
Plate LVI. fig. 4. 
White; ophthalmic region black, over which is a scarlet 
fringed membrane; irides yellowish-brown; bill and claws black. 
Fourteen inches long. Inhabits Europe and America. 
Genus 13.—PTEROCLES. — Temminck. 
Generic Character. —Bill of medium length, compressed and 
slender in some species ; upper mandible straight, slightly bent 
towards the point, nostrils basal, partly closed by a membrane; 
front, or acrotarsium, of the tarsus feathered ; the hinder part, 
or planta, naked; three anterior toes united the length of 
the first joint; hallux very small, and articulated high on the 
tarsus; tail subconic, in some species the two middle feathers 
elongated and filiform ; wings long, acuminated, reaching to 
within a third of the tip of the tail, the first quill longest. 
Pterocles bicincta. — The Double-Collared Pterocles. 
Plate LXVI1I. fig. I. 
Upper parts dull chestnut colour, transverely barred with 
black; epigastrium, abdomen, and crissum, dusky, with trans¬ 
verse arrow-shaped umber-coloured bands; wings chestnut above, 
with the secondaries fawn-coloured ; greater wing-coverts with 
transverse bands of dark burnt umber-brown, edged with white; 
legs an 1 feet fawn, the front of the tarsus transversely barred 
with .brown ; breast with a collar of ochre-yellow, beneath 
which is another of blackish-brown ; front of head gray. Ten 
inches long. Inhabits Africa. 
