8. CEXTHO(,i;i{Cl-S. SI 



1. Centrocercus urophasianus. 



Cock of the Tlaiiis, Lew's ^- Clark, ii. p. 180, sp. 2. 



Tetrao nroY>\^iisimu'^, Bonap. Zool. J. iii. p. 213 (1828) [Missouri]; 



id. Am. Orn. iii. p. oo, pi. xxi. ti;:-. 1 (1828); Dmiql. Tr. Linn. 



Soc. xvi. p. 133 (1829); Uonaj). Tr. Am. Phil. Soc. iii. p. 390 



(1830) ; Wik. III. Zool. pis. xKvi., x.vvii. (1831) ; Xutt. Man. Orn. 



i. p. cm (1832) ; And. Orn. lilorj. iv. p. 503, pi. 371 (1838) ; id. 



B. Amer. v. p. 108, pi. 297 (1842) ; Npu-b. Epj). P. R. Ii. ."^urv. vi. 



pt. iv. p. 9o (18o7) ; Nemcird, J.f. O. 1858, p. 431; Om. f/.-V. 



Bupl. Krp. ]). 280 (1858) [ Walla- WitUa] ; Grai/, Iland-l. B. ii. 



p. 276 (1870). 

 Tetrao (Centrocercus) uroplnisianua, Swains. Sf Richards. Faun. Bor.- 



Amer. ii. p. 358, pi. 58 (18:J1). 

 Centrocercus! urophasianus, Jard. Nat. Libr., Orn. iv. p. 140, pi. xvii. 



(1834) ; Gray, List, of B. pt. iii. Gall. p. 46 (1844) ; Baird, B. N. 



Am. p. 624" (I860) ; Coop. ^ Suckl. Rep. Expl. Miss. Riv. xii. 



no. 3, p. 222 (1860) ; ElUot, P. Ac. Philad. 1864, p. 23; id. Mon. 



Tetr. pi. xiii. (1865) ; Coues, Il/is, 1866, p. 265 [Soda Lake, 8. Cali- 

 fornia] ; Gray, List Gallince Brd. Mus. p. 87 (18i>7) ; Cooj). Calif. 



Orn. i. p. 53(5 (1870) ; Baird, Brew., ^- Ridtfw. N. Am. B. iii. p. 429 



( 1874) ; Couc.t, Bull. U. S. Geol. Sun: iv. p. 629 (1878) [Montana] ; 



Scott, Nntt. Orn. C. iv. p. 96 (1879) [Colorado] ; Mearns, Nntt. 



Orn. C. iv. p. 197 (1879) [Ft. Klamath]; Coues, Ket/, p. 580 



(1884) ; Dreio, Auk, ii. p. 17 (1885) [Colorado] ; A. O. U. Check-l. 



]). 176 (1886); Ridyw. Man. p. 205 (1887) ; Tuwnsend, P. U. S. 



Nat. Mus. X. pp. 2(i0, 235 (1887) [N. California]. 

 Sage Cock, Blliot, Mon. Tetr. pi. xiii. (1865). 



Adult male. General colour above black, verj- irregularly barred, 

 mottled, and marked with sandy grey, buff, and rufous, some of the 

 feathers, especially the wing-coverts, scapulars, and secondaries, 

 irregularly barred with white and the former with white shaft- 

 stripes ; quills and primary-coverts brown, the secondaries margined 

 at the tip with wlaito and mottled on tlie outer wob with buff; 

 sides of the head, chin, and throat spotted with black and white, 

 in some specimens the former, in some the latter colour pre- 

 dominating ; a white crescent on the front of tlie neck, followed by 

 a largo black patcli ; a lateral ruff of elongate white feathers on 

 each side of the neck, the shafts produced into long recurved pro- 

 cesses bearing black filaments ; chest white, the feathers short and 

 scale-like, with sharp-pointed shafts ; breast similar, but the tips of 

 the shafts are produced beyond the wel) into black bristles ; belly 

 black, whitish on the sides ; sides and thinks mottled with black, 

 brown, and buff. ;ind with whitish shaft-stripes; under tail-coverts 

 black, largely tipped with white. Tail dark brown, the basal two- 

 thirds of the featliers mottled with rufous and irregularly barred 

 with buff. Total length 28 inches, wing 12-o, tail 12, tarsus 2-2. 



Specimens after the summer moult are much more brightly 

 coloured ; and most of the markings on the new feathers of the 

 U])per parts are warm rufous buff instead of sandy whitish buff as 

 in the old ones. 



Allah female. DitYers from the male ehietly in having the chin 

 and throat white, and the fore part of tlie neck spotted witli 



VOL. XXII. (J 



