74 CHECK-LIST OF NORTH AMERICAN BIRDS. 



Falco rusticolus uralensis Sewertzov and Menzbier. Asiatic Gyrfalcon. 



[354c.] 



Falco uralensis Sewertzov and Menzbier, Orn. Geogr. Europ. Russl., 

 I, 1882, 288 (tab. 3). (Ural Mountains, Russia). 



Range. — Siberia to Kamchatka, islands in Bering Sea, and Bering Sea coast 

 of Alaska. South, casually, in winter to Washington. 



Falco rusticolus obsoletus Gmelin. Black Gyrfalcon. [3546.] 



Falco obsoletus Gmelin, Syst. Nat., I, Pt. i, 1788, 268. Based on the 

 Plain Falcon Pennant, Arct. Zool., 11, 208. (in freto Hudsonis = 

 Hudson Bay.) 



Range. — Northern North America from Point Barrow to Labrador. South 

 in winter to Nova Scotia, Quebec, and Maine, casually to New York, New 

 Hampshire, Massachusetts, Rhode Island, and Connecticut; also probably 

 South Dakota, Kansas, Minnesota, Ohio, and Pennsylvania ^ although some of 

 these records doubtless represent the gray phase of F. r. candicans. 



Falco mexicanus Schlegel. Prairie Falcon. [355.] 



Falco mexicanus " Lichtenstein, " Schlegel, Abh. Geb. Zool., Heft iii, 

 1850, 15. (Mexico.) 



Range. — Transition and Austral zones from the eastern border of the 

 Great Plains -and from southern British Columbia, southern Alberta, and 

 southeastern Saskatchewan to southern Lower California and southern Mexico. 

 Casual east to Manitoba, Minnesota, and Illinois. 



Subgenus RHYNCHODON Nitzsch. 



Rhynchodon Nitzsch, Obs. Avium Art. Carot. Comm., 1829, 20. Type, 

 by subs, desig., Falco peregrinus Tunstall (A. O. U. Comm., 1886). 



• Falco peregrinus peregrinus Tunstall. Peregrine Falcon. [356.] 



Falco Peregrinus Tunstall, Orn. Brit., 1771, 1. Based on the Peregrine 

 Falcon Pennant, Brit. Zool., 1766. (Northamptonshire [England].) 



Range. — Breeds from northern Siberia and Novaya Zemlya to the Pyren- 

 ees, Alps, and northern Italy, east to the Urals. Winters south to Africa and 

 the Indian Peninsula. Casual in Greenland.- 



^ The status of the Gyrfalcons is stUl undetermined. The Greenland birds 

 are generally regarded as dimorphic, with a white and gray phase, but recent 

 examinations of large series would indicate three geographic forms, a white and 

 two gray ones, one similar to F. r. rusticolus of Europe, and the other close to 

 F. r. islandus of Iceland. The Labrador form may not be separable from one 

 of these and the identity of winter stragglers to the United States is uncertain. 

 Cf. also Klotz, Wilson Bull., 1929, 207; Schicler, Danmarks Fugle, III, 1931. 



2 Schalow, Vogel Arktis, 1904, 225. Schi0ler refers all Greenland birds to 

 anatum which he says breeds on the west coast. 



