order falconiformes. 73 



Family FALCONIDAE. Caracaras and Falcons, 

 Subfamily POLYBORINAE. Caracaras. 



Genus POLYBORUS Vieillot. 



Polyborus Vieillot, Analyse, 1816, 22. Type, by monotypy, Caracara, 

 BuFFON = Falco tharus Molina. 



Polyborus cheriway auduboni Cassin. Audubon's Caracara. [362.] 



Polyborus Auduhonii Cassin, Proc. Acad. Nat. Sci. Phila., [XVII] 1865, 

 No. 1, Jan.-March [Aug. 7], 2. (Florida.) 



Range. — Northern Lower California, southwestern Arizona, Texas, and 

 Florida south through Mexico and Central America. Accidental in Ontario. 

 [An allied race occurs in South America.] 



Polyborus lutosus Ridgway. Guadalupe Caracara. [363.] 



Polyborus lutosus Ridgway, Bull. U. S. Geol. and Geog. Surv. Terr., I, 

 1874-5, 2d ser.. No. 6 [Feb. 8, 1876], 459. (Guadelupe Islands [ = 

 Guadalupe Island], Lower California.) 



Range. — Extinct. Formerly occurred on Guadalupe Island, Lower Cali- 

 fornia. 



Subfamily FALCONINAE. Falcons. 



Genus FALCO Linnaeus. 



Falco Linnaeus, Syst. Nat., ed. 10, I, 1758, 88. Type, by subs, desig., 

 Falco subbuteo Linnaeus (A. O. U. Comm., 1886). 



Subgenus HIEROFALCO Cuvier. 



Hierofalco Cuvier, Regne Animal, T, 1817 [Dec. 7, 1816], 312, Type, by 

 monotypy, Falco candicans Gmelin. 



Ffilco rusticolus candicans Gmelin. White Gyrfalcon. [353.] 



Falco candicans Gmelin, Syst. Nat., I, Pt. i, 1788, 275. (in Islandia et 

 Scotia boreali.) 



Range. — -Resident in Greenland, eastern Arctic America (probably), Spitz- 

 bergen, and Franz Josef Land (probably). Casual in winter south to British 

 Columbia, Montana, Ontario, Quebec, Nova Scotia, and Maine, and to the 

 British Isles, France, and Germany. 



