11. TETRASXES. 93 



/'. $ imm. sk. Tlaliodadi, Auir. Dr. MoKinlav [P.]. 



g'-i'. r;?aa. .sk. Jliikodrtdi (//. J(7»Vf/y). Tweeddale Coll. 



et St. 



Htihrul between Lyrurus tetrix and Tetrastes bonasia. /See p. 58. 



2. Tetrastes griseiveutris. 



Tetrastes jrriseiventris, Mcnzb. Bull. Mono. Iv. pt. i. p. lOo, pi. iv. 



(1880) [Perm] ; Reich. S^- Schal. J.f. 0. 1881, p. 73 ; Homeyer, MT. 



ont. Ver. Wien, 1883, p. 228. 

 Tetrao griseiventris, Seebohm, Ibis, 1884, p. 430, pi. xi. ; id. P. Z. S. 



1884, p. 409. 



Adult male. Easily distinguished from T. hunasia by having no 

 white tips to the feathers on the sides of the neck, and in fact no trace 

 of the incipient ruffle : the scapulars and wing-coverts also devoid of 

 any white markings ; the chin white ; throat black, each feather tipped 

 with dark red and not circumscribed by any while band ; fore part 

 of neck and chest a mixture of rufous and black, barred and tipped 

 with grey ; rest of the underparts grey with indistinct bars of black, 

 becoming very faint on the thighs ; and the black band across the 

 outer tail-feathers not nearly so well defined and more or less 

 mottled with butf. Total length 14 inches, wing 6*5, tail 4-7, 

 tarsus l-;5. 



Adidt feniaJc. Differs from the male in having the feathers of tho 

 throat black, widely tipped with butf; those of the chest black, 

 barred or marked with rufous and tipped with sandy grey ; and the 

 rufous feathers of the sides and flanks with wide irregular black bars. 



Hab. Eastern llussia ; Government of Perm. 



3. Tetrastes severtzovi. 



Tetrastes sewertzowi, Prjcv. Monf/oUa, ii. p. 130, pi. xviii. (1876) 

 id. in Rou-l. Orn. Misc. ii. p. 430, pi. 52 (1877) ; Uedit. J. f. O. 

 1880, pp. 538, 540 [IloaugLo &. Koko-uor]. 



Adidt male. Differs chiefly from T. bona.iia in having not only 

 the mantle, but the whole of the lower back, rump, and upper tail- 

 coverts eijually distinctly barred with black; on each side of the 

 neck a more marked line of elong;ite, black, white-tij)ped feathers, 

 indicating the incipient ruffle ; the whole of the underparts black, 

 barred and tipped with -nliite, the sides, as usual, being mixed 

 with rufous ; all the outer tail-feathers black, with narrow wide-set 

 white bars and tips. Total length 13-.3 inches, wing Iv", tail o*3, 

 tarsus 1-.3. 



Adult female. Differs chiefly from the female oiT. honasia in the 

 same resyiects as the male, from which latter she is distinguished by 

 having the chin and throat buff tipped with black, as well as by her 

 somewhat smaller size. 



Hub. Xansu, Koko nor, and the Hoangho River. 



a,b. c? ? ad. sk. Kansu, Oct. Ikn-ezowsky Coll. 



