336 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



? FaJco novae-terrae Shaw, Gen. Zool., vii, pt. 1, 1809, 147 (Labrador; ex Latham, 



Index Orn.). 

 Falco niger (not of Gmelin, 1788) Wilson, Amer. Orn., vi, 1812, 82, pi. 53, figs. 



1, 2 (e. Pennsylvania, etc.; coll. Peale's Mus., ex Falco niger, the Black Hawk, 



Bartram.). — Bonaparte, Journ. Acad. Nat. Sci. Philadelphia, iii, pt. 2, 1824, 



349; Obs. Wilson's Nomencl. Amer. Orn., 1826 [10]. 

 Buteo niger Stephens, Shaw's Gen. Zool., xiii, pt. 2, 1826, 47 (North America). 

 Archibuteo niger Pelzeln, Verh. zool.-bot. Wien, 1862, 153. 

 Buteo ater Vieillot, Nouv. Diet. Hist. Nat., iv, 1816, 482 (new name for Falco 



niger Wilson). 

 Falco harlani (not of Audubon) Peabody, Rep. Orn. Massachusetts, 1839, 269. 

 Archibuteo ferrugineus Townsend, Cruise Corwin in 1885 (1887), 92 (lower 



Kowak River, Alaska). 

 Buteo platijpterus Soper, Auk, xl, 1923, 498 (Wellington and Waterloo Counties, 



Ontario) . 



BUTEO LAGOPUS KAMTSCHATKENSIS DementieT 



Siberian Rough-legged Hawk 



Adult (sexes alike). — Similar to the light phase of Buteo lagopus 

 s.-johannis, but larger andmththe pale margins of the feathers of the 

 upperparts broader, giving the bird a paler appearance; below whiter 

 with the dark streaks narrower; upper tail coverts white with only a 

 median brow^iish streak. This race has no melanistic phase. 



Immature and juvenal (sexes alike) .—Similar to the corresponding 

 plumage of Buteo lagopus s.-johannis but with the pale margins of the 

 dorsal feathers wider and whiter; size larger. 



Natal down. — Not knowTi, probably similar to that of Buteo lagopus 

 s.-johannis. 



Adult male.— V^ing 416-435 (428.2); tail 222-231.4 (227.1); culmen 

 from cere 20-22 (21.5); tarsus 65-67 (06); middle toe without claw 

 34-34.9 (34.3 mm.) (3 specimens). 



Adult female.— V^^ing 436-470 (452); tail 230-241 (236.6); culmen 

 from cere 22-23.5 (23.1); tarsus 68-70 (69); middle toe without claw 

 40-42.5 (41.2 mm.) (3 specimens). 



Range. — Breeds throughout northern Siberia from the Obi River to 

 the Kolyma River and Kamchatka, to Bering Island, and to the 

 vicinity of St. Michael and the Noatak River, east along the Arctic 

 coast to Point Barrow, northwestern Alaska; south to Lake Baikal 

 and Ussuriland and the Kurile Islands. 



Winters in Ussuriland, Bering Island (?), central Asia, Turkestan, 

 Transcaspia, the Black Sea, rarely to northern Iran, to China, Korea, 

 and to Japan (Honshu), and Ishigaki, Ryukyu Islands. Said to 

 have been taken once in Poland, where it would have to be considered 

 accidental. 



Type locality. — Kichtschik River, Kamchatka. 



