87 



*151b. Buteo alhicaudatus exiguus, Chapm., Bull. Llanos of 



Am. Mus. N.H., xxxiv., p. 637 (1915). E. Columbia & 



[Barrigon, Col.] E. into 



Columbian White-tailed Hawk. Venezuela. 



" Notably smaller [wing (^ 388 mm.] ; 

 with the upper parts, particularly the head 

 and sides of the neck, darker and more 

 slaty." 



151c. Buteo alhicaudatus colonus Berl., J.f.O. Cura9ao, 



1892, p. 91. [Curagao.'] Bonaire, and 



Cura9ao White-tailed Hawk. Aruba Is. 



Ad. plumage not seen ; imm. black, 

 abdomen somewhat barred with buff ; tail 

 with indistinct darker bars. [Tring Mus.] 



Gen. XXXIII. TRIORCHIS Kaup (1829). 

 [ = Archibuteo Brehm (1828). {nom. nud.)] 

 Type Falco lagopus Gmel. ( = F. lagopus Briinn. 



With general characters and appearance of Buteo, 

 but tarsi feathered to the toes. 



*fl52. Triorchis lagopus lagopus (Briinn.), Orn. 

 Bor., p. 4 (1764). [Christiansoe, near 

 Bornholm.] 

 Rough-legged Buzzard. 



Wing (^ 420-450, ? 440-460 mm. ; above 

 deep brown with paler margins ; head, 

 neck, throat and chest white, streaked with 

 dark brown ; scapulars and least wing- 

 coverts with white bases ; upper tail- 

 coverts banded with white ; tail white, 

 teriTiinal portion ashy, with sub-terminal 

 blackish band ; centre of belly and flanks 

 deep brown mottled with white ; thighs and 



N. Europe and 

 N. Asia ; in 

 winter S. to 

 Brit. Isles and 

 Mediterranean. 



