87 
*151b. Buteo albicaudatus 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 g 388 mm.]; 
with the upper parts, particularly the head 
and sides of the neck, darker and more 
slaty.”’ 
15lc. Buteo albicaudatus colonus Berl., J.f.0. Curagao, 
1892, p. 91. [Curagao.] Bonaire, and 
Cura¢gao 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. 
*1152. Triorchis lagopus lagopus (Briinn.), Orn. N. Europe and 
Bor., p. 4 (1764). [Christiansoé, near N. Asia; in 
Bornholm. | winter S. to 
Rough-legged Buzzard. Brit. Isles and 
Mediterranean. 
Wing ¢ 420-450, 2 440-460 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, 
terminal portion ashy, with sub-terminal 
blackish band ; centre of belly and flanks 
deep brown mottled with white ; thighs and 
