THE CAPERCAILZIES. 53 



provinces of Russia, but, so far, I have been unable to ascer- 

 tain the exact locality whence they are obtained. It must be 

 added that, though some of these intermediate birds have 

 much white on the breast and belly, and are altogether lighter 

 than Western European examples, the Ural birds are so very 

 much paler, and show no trace of variation among themselves, 

 that they may be fairly considered at present as representing a 

 well-marked geographical sub-species, though most probably 

 future investigations will show that they completely intergrade 

 with typical western and eastern forms. 



II. THE SLENDER-BILLED CAPERCAILZIE. TETRAO 

 PARVIROSTRIS. 



Tetrao urogalloides, Middend. {nee Nilss.*), Sibir. Reise, ii. pt. 



ii. p. 195, pi. xviii. (1851); Elliot, Mon. Tetraon. pi. vi. 



(1865). 

 Tetrao parvirostris, Bonap. C. R. xlii. p. 880 (1856) ; Ogilvie- 



Grant, Cat. B. Brit. Mus. xxii. p. 66 (1893). 



Adult Male. — Mantle brownish-black, not barred, and the 

 shoulder-feathers less widely tipped with white, the white tips 

 forming an i7iterrupted line of white spots. Total length, 35 

 inches; wing, 15; tail, 14*8; tarsus, 27. 



Adult Female. — Mantle strongly barred with black ; the breast 

 and belly black, barred with buff and tipped with white ; and 

 the white spots on the shoulder-feathers forming an interrupted 

 line of white spots. Total length, 25 inches; wing, 11 '6; tail, 

 77 ; tarsus, 17. 



Range — This species takes the place of T. urogallus in the 

 pine-forests of the north east of Siberia to the east of Lake 

 Baikal, and is also found in the island of Saghalien, but not in 

 Kamtschatka. 



* This name was previously used by Nilsson for the hybrid botween the 

 Black Grouse and Capercailzie. 



