Severtzoff's 'Fauna of Turkestan.' 103 



18. BUTEO FEROX (Gm.). 



Severtzoff recognizes three forms of this species, as follows : 



«. Buteo leucurus, SevertzoflF, p. 63. 



Horizontal range. Breeds in districts 1., II., III., and IV. 

 Vertical range. Breeds in districts 1, 2, 3, and 4, and is 

 common in district 2. 



/8. Buteo rufinus, Severtzoff, p. 63. 



Horizontal range. Breeds in districts I., II., III., and IV. 

 Vertical range. Breeds in districts 1 and 2, in the latter of 

 which it is common. 



7. Buteo nigricans, Severtzoff, p. 63. 



Horizontal range. Is found during the breeding-season in 

 districts III. and IV. 



Vertical range. Breeds in district 2. 



Respecting the above three forms he writes (p. 112) as fol- 

 lows : — " B. rufinus differs from B. leucurus in having dark 

 bands on the tail, the latter having the tail uniform light 

 brown, or greyish brown. The markings on the tail vary 

 considerably, being sometimes confined to the terminal por- 

 tion, whereas in other specimens the entire tail is very dis- 

 tinctly barred. B. nigricans is blackish brown or blackish in 

 colour, the plumage having a metallic lustre : its tail is grey 

 barred with black ; but in some specimens the tail is reddish 

 grey, the nape, breast, and shoulders being similarly coloured, 

 and in fact these specimens are intermediate between B. ni- 

 gricans and B. rufinus. It appears that the gradation between 

 these forms is about the same as that between B. leucurus 

 and B. vulgaris ; and it would therefore seem as if these had 

 originally belonged to one species, B. vulgaris inhabiting the 

 northern forests, and B. leucurus inhabiting the southern 

 steppes." 



19. Buteo vulgaris, Leach ; Severtzoff, p. 63. 

 Horizontal range. Rare during winter in district I. 

 Vertical range. Rare during winter in districts 2 and 3. 



20. Archibuteo lagopus (Gm.). 

 Buteo lagopus, Severtzoff, p. 63. 



