400 



CENTROCERCUS UROPHASIANUS, SAGE COCK. 



gland nnd tlio Middle States. Although Allen gives the Euffed Grouse 

 as an inhabitant of the 'mountains of Colorado,' the most diligent 

 search failed to discover a trace of it; while all the hunters and trap- 

 pers with whom I have conversed assured me that it is never found there 

 at all." 



TETRAO OBSCURUS var. RICHARDSONI, (Dougl.) Coues. 

 Richardson's, or Black-tailed Grouse. 



Tetrao richardsom, Dougl., Trans. Linu. Soc. xvi, 141. — Wils., Zool. lUust. pis. 30, 31.— 



Lord, Pr. Roy. Arty. Inst, iv, 1864, 122.— Gray, Cat. B. Br. Mus. v, 1867, 86.— 



Coop., B. Cal. i, 1870, 528. 

 Dench-agapus richards ni, Elliot, Pr. Phila. Acad. 1864, 23 ; Monog. Tctr. pi. — . 

 Tetrao obscurus, Sw. & Rich., F. B. A. ii, 1831, 344, pis. 59, GO, evidently this form. (Also 



of Jitduhon and Baud, partly. Not oi Say.) 

 Tetrao obscurus var. richardsoni, Coues, Key, 1872, 233. — Mkrr., Rep. Geol. Surv. Ter. 



1872, 698. 

 Canace obscurus var. richardsoni, B. B. & R., Ni A. B. iii, 1874, 427, pi. 59, f. 4. 



Hab. — " Central Rocky Mountains, from South Pass, and northward to Fort Liard, 

 H.B.T." (Cooper.) 



List of specimens. 



19168 

 19169 



W. side R. Mts. 



do 



Yellowstone R . 



June 5, 1860 

 May 31, 1860 

 July 23, 1860 



F.V.Hayden. 



do 



G.H. Trook.. 



19.00 

 19.25 

 22.50 



28.50 

 27.00 

 31.50 



9.25 



Late Expeditions. — 62216-22, T6ton Canon and North Fork, Idaho. 



In this slight variety of the common Dusky Grouse the general colors 

 are darker, and the terminal slate bar on the tail is reduced to a mini- 

 mum, or wanting altogether. It is clearly the form described and 

 figured by Swainson and Richardson, as above, who speak of it as in- 

 habiting the Rocky Mountains from lat. 40° to lat. G7°, and perhaps still 

 further, and refer it to the true T. ohscnrus of Say. These authors men- 

 tion one of Mr. Douglas' specimens, in the Edinburgh Museum, as being 

 younger, but " evidently the same species." Audubon made no distinc- 

 tion of the two varieties; Baird cites '^ richardsoni" as synonymous, 

 but noted the above characters of certain specimens. As Dr. Cooper 

 has remarked, the apparent distribution of the variety is peculiar, it 

 being embraced to the East, West, and South, by that of the ordinary T. 

 obscurus. 



CENTROCERCUS UROPHASIANUS, (Bp.) Sw. 



Sage Cock; Cock of the Plains. 



Tetrao tiropJiasiamis, Bp., Zool. Journ. iii, 1828, 214 ; App. Svn. U. S. Birds in Ann. Lye. 

 N. Y. p. 442 ; Trans. Am. Phil. Soc. iii, 1830, 390 ; Am. Orn. iii, 1830, 212, pi. 21, 

 fig. 2.— Doug., Trans. Linn. Soc. xvi, 1829, 133, sp. 1.— Wils., Zool. Illust. 1831, 

 pis. 26, 27.— NUTT., Man. i, 1832, 666.— Aud., Orn. Biog. iv, 1838, 503, pi. 371; 

 Syn. 1839, 205 ; B. Am. v, 1842, 106, pi. 297.— Bd., Stansbury's Rep. 1852, 319.— 

 Newb., p. R. R. Rep. vi, 18.57, 95.— Maxim., J. f. O. vi, 1858, 431. 



Tetrao (Centroccrcns) urophaslanus, Sw. & Rich., F. B. A. ii, 1831, 358, pi. 58. 



Cenirocercus %iroj?hasianus, Jard., Nat. Lib. Birds, 140, pi. 17. — Bd., N. N. A. 1858, 624. — 

 Coop. & Suck., N. II. Wash. Ter. 1860, 222.— IIayd., Rep. 1862, 172.— Coues, 

 Pr. Phila. Acad. 1866, 94 (Mojave River, Cal., latitude about 35").— Coop., B, 

 Cal. i, 1870, 536.— Allen, Bull. M. C. Z. iii, 1872, 181.— Holdex-Aiken, Pr. 

 Bost. Soc. XV, 1872, 209.— Snow, B. Kans. 1H72, No. 164 (Western Kansas).— 

 Coues, Key, 1872, 233.— Merr., Rep. U. S. Geol. Surv. Ter. 1872, 699.— B. B. & 

 R., N. A. B. iii, 1874, 429, pi. 60, f. 2, 4. 



Cocic of the Flains, Lewis & Clarke, ii, 180, sp. 2. 



