400 



CEXTEOCEECUS UROPHASIANUS, SAGE COCK. 



gland and the Middle States. Although Allen gives the Euffed Gronse 

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

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

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

 at all." 



TETEAO OBSCUEUS var. EICHAEDSONI, (Dougl.) Cones. 

 Eicbardson's, or Black-tailed Grouse. 



Tetrao richardsovi, Dougl., Trans. Linu. Soc. xvi, 141.— WiLS., Zool. Illust. pis. 30, 31.— 



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



Coop., B. Cal. i, 1870, .5-28. 

 Dendragapus richards ni, Elliot, Pr. Phila. Acad. 1864, 23 ; Monog. Tetr. pi. — . 

 Tetrao oiscurus, S\v. & Eich., F. B. A. ii, 1831, 344, pis. 59, 60, evidently this form. (Also 



ot Audubon and Baird, partly. Xot oi Say.) 

 Tetrao oiscurus var. richardsoni, CouES, Key, 1872, 233.— Mere., Eep. Geol. Snrv. Ter. 



1872, 698. 

 Canace ohseurus var. richardsoni, B. B. & E., NI A. B. iii, 1874, 427, pi. 59, f. 4. 



Hai. — " Central Eocky Mountains, from South Pass, and northward to Fort Liard, 

 H. B. T." (Cooper.) 



Late Expeditions. — 62216-22, T^ton 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 Eichardson, as above, who speak of it as in- 

 habiting the Eocky Mountains from lat. 40° to lat. 67°, and perhaps still 

 further, and refer it to the true T. ohseurus 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 '■'■ ri<ihardsonV^ 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. 

 ohseurus. 



CENTEOCEECUS UEOPHASIANDS, (Bp.) Sw. 



Sage Cock; Cock of the Plains. 



Tetrao urophasiamis, Bp., Zool. Joum. iii, 1828, 214 ; At)p. Syn. tJ. S. Birds in Ann. Lye. 

 N. y. p. 442 ; Trans. Am. Phil. Soc. iii, 1830, 390 ; Am. Om. 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., Om. Biog. iv, 1838, 503, pi. 371; 

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

 News., P. E. E. Eep. vi, 1857, 95.— Maxim.. J. f. O. vi, 1858, 431. 



Tetrao (Centrocercus) urophasianus, Sw. & Eich., F. B. A. ii, 1831, 358, pi. 58. 



Cenirocercus urophasianus, Jaed., Nat. Lib. Birds, 140, pi. 17. — Bd., N. N. A. 1858, 624. — 

 Coop. & Suck., N. H. Wash. Ter. 1860, 222.— Hayd., Eep. 1862, 172.— Coues, 

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

 Cal. i, 1870, 536.— Allex, BuU. M. C. Z. iii, 1872, 181.— Holden-Aiicen, Pr. 

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

 COUBS, Key, 1872, 233.— Mep.k., Eep. U. S. Geol. Surv. Ter. 1872, 699.— B. B. & 

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



Cock of the Plmns, Lewis & Clarke, ii, 180, sp. 2. 



