TETRAONIN^ TETRAO. 
205 
* -x- * * Toes partially feathered. Tail graduated. 
299. 5. Tetrao Urophasianus, Bonap. Pheasant-tailed 
. Grouse. — Cock of the Plains. 
Plate CCCLXXI. Male and Female, 
Male with bristle-feathers on the sides of the neck, on its lower 
part small, scale-like feathers ; a large bare yellow space on each side, 
capable of being inflated ; tail long, graduated, of twenty, stiffish, 
acuminate feathers. Upper parts light yellowish-brown, variegated 
with brownish-black, and yellowish- white ; primary quills chocolate- 
brown, thin outer webs, and part of their inner margins mottled with 
yellowish- white ; tail with about ten bands of yellowish- white on the 
outer webs, which are otherwise variegated like the back, the inner 
webs nearly plain brown ; throat and fore part of neck whitish, longi- 
tudinally spotted with brownish-black ; a narrow white band across 
the throat ; sides of the neck, and fore part of breast pure white j sides 
variegated like the back ; axillars and lower wing-coverts white ; and 
part of breast and abdomen black ; lower tail-coverts brownish-black, 
largely tipped with white ; tibial and tarsal feathers brownish-grey, 
faintly barred with brown. Female much smaller, and differing in 
being destitute of the bare skin on the neck, the plumage entirely of 
ordinary texture, the tail less elongated, with the feathers less narrow ; 
upper parts variegated as in the male, lower dull yellowish-grey, un- 
dulated and streaked with dusky ; middle of breast brownish-black, 
lower tail-coverts tipped with white, 
Male, 80, 86. Female, 22. 
Rocky Mountains and Columbia River, northward. Once seen on 
the Missouri. Abundant. Partially migratory from high to low grounds 
in autumn and winter. 
Tetrao urophasianus, Bonap. Amer. Orn. v. iii. pi. 21. 
Tetrao (Centrocereus) urophasianus, Cock of the Plains, Swains. & Rich. F. Bor. 
Amer. v. ii. p. 358. 
Cock of the Plains, Nutt. Man. v. i. p. 666. 
Cock of the Plains, Tetrao urophasianellus, Aud. Orn. Biog. v. iv. p. 503. 
300. 6. Tetrao Phasianellus, Linn. Sharp-tailed Grouse. 
Plate CCCLXXXII. Male and Female. 
A decurved crest of narrow feathers ; a bare space on each side of 
the neck capable of being inflated ; tail short, much graduated, of six- 
teen feathers, all of which are more or less concave, excepting the two 
middle ones along the inner edge, obliquely and abruptly terminated, 
the two middle projecting an inch beyond the next. Upper parts va- 
riegated with light yellowish-red, brownish-black, and white, the lat- 
ter in terminal triangular, or guttiform spots on the scapulars and 
wing-coverts ; quills greyish-brown, primaries with white spots on the 
