BONASA GRISEIVENTRIS. 



(MENZBIER'S HAZEL-GROUSE.) 



Tetrastes gryseiventris, Menzbier, Bull. Mosc. lv. pt. 1, p. 105, pi. iv. (1880). 

 Tetrao griseiventris (Menzb.), Seebohm, Ibis, 1884, p. 430, pi. xi. 

 Tetrastes griseiventris, Menzb., Grant, Cat. B. Brit. Mus. xxii. p. 93 (1893). 



Figurce notabiles. 

 Menzbier, ut supra. ; Seebohm, ut supra. 



$ ad. corpore suprk saturate griseo-schistaceo, pileo saturatiore plumis nigricante fasciatis : uropygio et 

 supracaudalibus saturate griseo-schistaceis, indistincte fasciatis : scapularibus et secundariis intimis 

 nigro et rufescenti-fusco marmoratis : tectricibus alarum griseo-fuscis, griseo-schistaceo et sordide 

 cervino marmoratis : remigibus fuscis, in pogonio exteruo rufescenti-cervino marmoratis : cauda ut in 

 B. betulind, sed nee albo apicata et fascia nigra, subterminali indistincta : stria pone supraoculari et mento 

 albis : gula. nigra, indistincte rufescente notata : collo et pectore griseo-scbistaceis, rufescente notatis et 

 nigro transfasciatis : corpore reliquo subtus saturate griseo indistincte nigro-faseiato, hypochondriis 

 rufescente tinctis : rostro nigricanti-corneo : pedibus griseo-fuscis : iride fusca. 



Adult Male (Tscberdyn, October) . Upper parts dark grey, tbe feathers on the head and back barred with 

 blackish, the head rather darker; rump and upper tail-coverts dark grey, with indistinct darker bars; 

 scapulars and some of the inner secondaries marbled with black and reddish brown ; wing-coverts 

 brownish grey, marbled with dark grey and dull warm buff ; quills dark brown, the outer web marbled 

 with warm buff; tail as in B. betulina, but without the white tip and the black subterminal band, this 

 latter being barely indicated ; a streak extending backwards from above the eye and chin white; throat 

 black, slightly marked with dark rufous ; neck and breast grey, barred with black and marked with 

 rufous ; rest of the underparts grey, indistinctly barred with black ; the flanks tinged with rufous : bill 

 blackish horn ; feet greyish brown; iris brown. Total length about 14 inches, culmen 09, wing 6'6, 

 tail 4' 8, tarsus 1-35. 



Adult Female (Tscherdyn, October). Differs from the male merely in having less grey and more brown in 

 the plumage, the head and neck especially being more boldly marked with black and reddish brown, 

 and the tone of colour on the underparts is more of a sandy or buffy grey, and not so clear grey as in 

 the male. 



Obs. In both the males in my own and the Rothschild collections the white patch on the chin is small, 

 and the white streak above and behind the eye, which is very clearly denned in both the male and 

 female above described and figured, is entirely wanting, and I think it probable that these are 

 immature birds. 



This Hazel-Grouse, so far as we know at present, is found only in North-eastern Russia, west of 

 the Ural range, chiefly in the Perm and Olonetz Governments. It was at first looked on by 



