90 ALLEN'S NATURALISTS LIBRARY. 



VI. THE CAUCASIAN SNOW-COCK. TETRAOGALLUS CAUCASICUS. 



Tetrao caucasica^ Pall. Zoogr. Ross. -As. ii. pp. 76, 87 (note), 



pi. (181 1). 

 Choiirtka alpijui, Motschoulski, Bull. See, Mosc. No. i. p. 95, 



pis. viii. viii. bis and ix. (1839.) 

 TetnwgaUus Cimcasicus^ March, Rev. Zool. 1877, p. 354, pi. 133 ; 



Ogilvie-Grant, Cat. B. Brit. Mus. xxii. p. 109 (1893). 

 Megaloperdix cancasica, Radde, Orn. Caucas. p. 335, pi. xxi. 



figs. I and 2 (1884). 

 Adult Male and Female. — Resemble T. caspius in general plum- 

 age, but the back of the head and nape are rust-red, and there 

 is a dull chocolate band down each side of the throat ; the 

 whole upper back is barred and mottled with black and buff, 

 and the chest is blackish-grey, irregularly barred and mottled 

 with buff. Total length, 21 inches; wing, io"8; tail, 6*8 ; tar- 

 sus, 2*4, 



Range. — Higher ranges of the Caucasus Mountains. 



THE RED-LEGGED PARTRIDGES. GENUS CACCABIS. 



Caccabis, Kaup, NatLirl. Syst. p. 183 (1829). 



Type, C. saxatilis (Wolf and Meyer). 



The feathers on the feet scarcely extending below the tarsal 

 joint ; tail composed of fourteen feathers, somewhat rounded, 

 and five-eighths of the length of the wing ; first flight-feather 

 about equal to the sixth, third slightly the longest ; throat 

 covered with feathers ; sub-terminal part of the outer webs of 

 the outer (primary) flight-feathers buff ; sides and flanks trans- 

 versely barred^ in marked contrast to the rest of the plumage 

 of the under-parts. Sexes similar. Male provided with a pair, 

 or sometimes more, of stout blunt spurs. 



I. THE ROCK RED-LEGGED PARTRIDGE. CACCABIS SAXATILIS. 



Perdix saxatilis^ Wolf and Meyer, Hist. Nat. Ois. AUem. p. 

 87, pi. 48 (1805); Gould, B. Europe, iv. pi. 261, fig. 2 

 (1837); Gigl. Iconogr. Av. Ital. pi. 252 (1881). 



