TOWNSEND AND ALLEN: LABRADOR BIRDS. 369 
Falco rusticolus gyrfalco (Linn.). 
GYRFALCON. 
Rare visitor. 
The A. O. U. check-list for 1895 records this form for “Arctic 
America, from Northern Labrador and Hudson Bay to Alaska.” 
‘There is a specimen in the Bangs’ collection, no. 9745, from Okkak, 
taken September, 1896. We obtained a good skin of this form of 
gyrfalcon taken by the Eskimos at Hopedale in the winter of 1905-06. 
It was identified by Mr. William Brewster. Of considerable interest 
in this specimen is the presence of a white and mottled tail feather, 
the first to the left of the center. This feather is entirely different 
from the others being nearly white with considerable mottling and 
spotting of dark brown on the outer web, and eight fairly distinct 
half bars on the inner web. The markings are more distinct in the 
distal half of the feather and are fainter on the lower surface. Feathers 
similar to this occur in the tails of some specimens of zslandus and 
suggest that the bird may have been changing from one to the other 
color phase. Both the white feather and the dark ones appear to be 
of the same age, however, all being slightly brown. The case may 
have been one of partial albinism only. The observations of Hagerup 
(The Birds of Greenland,” edited by Montague Chamberlain, 
Boston, 1891) are of interest in this connection. He obtained speci- 
mens of the white form with dark spots on the thighs and ventral re- 
gions, that resembled in this respect specimens of rusticolus. He 
says: “‘As Holbéll and Flucker repeatedly observed mated pairs, one 
of which was white (F’. islandicus), and the other dark (F’. rusticolus), 
and as Holbdll also found light and dark-colored young in the same 
nest, I conclude with these observers that there is but one species of 
Gyrfalcon found in Greenland.” 
Falco rusticolus obsoletus (Gmel.). 
Buack GyRFALCON; LABRADOR GYRFALCON. 
Common permanent resident. 
This is the variety labradorius of Audubon. He found a pair of 
these birds with two young on August 6, 1833, eight or ten miles from 
Bradore. Stearns found the Black Gyrfalcon in southern Labrador 
