AVESTERN BURROWING OWL 395 



Lesser Antilles; and the birds of the Revillagigedo Island group, off 

 the west coast of Mexico, has been named #. c. rostrata. The typical 

 form S. c. cunicularia is South American. 



The western burrowing owl (S. c. hypugaea) occupies the North 

 American portion of the ranges, except for Florida. It is migratory 

 in the northern areas, and in some parts of Central America it 

 apparently occurs only as a winter resident. 



Winter range. — As stated above, this species is migratory only in the 

 northern parts of its range. It will occasionally remain throughout 

 the winter almost to the limits of the breeding range but ordinarily 

 at this season it is found north to California (East Park, St. John, and 

 Chico) ; southern Arizona (Parker and Tucson) ; southern New Mexico 

 (Mesilla Park, Tularosa, and Carlsbad); Texas (Lipscomb, Decatur, 

 and Corsicana) ; and southern Florida (Miakka Lake, Istokpoga, and 

 Fort Drum). 



Spring migration. — Early dates of spring arrival are: Kansas (may 

 winter rarely in southern part) — Wellington, March 22; Wichita, 

 April 7; Ellis, April 8. Nebraska (winters rarely) — Beatrice, March 

 24; Valentine, April 6; Antioch, April 8. Iowa — Sioux City, March 

 20; Ash ton, April 22. South Dakota — Fort Pierre, April 5; Forest- 

 burg, April 6; White River, April 15. North Dakota — Marstonmoor, 

 April 7; Jamestown, April 10; Argusville, April 20. Minnesota — 

 Sherburn, April 18. Manitoba — Margaret, April 14 ; Aweme, April 24. 

 Saskatchewan — Indian Head, April 24. Colorado (winters rarely) — 

 Grand Junction, March 23; Loveland, March 28; Denver, April 14. 

 Utah — Salt Lake County, April 17. Wyoming — Wheatland, March 

 12 ; Laramie, April 15. Idaho — Meridian, March 5 ; Deer Flat Refuge, 

 March 18. Montana — CorvaUis, April 15; Billings, April 21; Fort 

 Custer, April 25. Nevada (may winter rarely) — Carson City, April 

 26. Oregon (winters rarely) — Camp Harney, March 13; Klamath 

 Lake, March 31. Washington (may winter rarely) — Walla Walla, 

 March 1; North Yakima, March 7; Prescott, March 19. British 

 Columbia (winters rarely in extreme southern part) — Okanagan, 

 April 2 ; Osoyoos Lake, April 6 ; Penticton, April 15. 



Fall migration. — Late dates of fall departure are: Washington 

 (may winter rarely) — North Yakima, October 1; Grays Harbor, 

 October 19. Oregon (winters rarely) — Cold Springs, October 14. 

 Nevada (may winter rarely) — Overton, November 22. Montana — 

 Big Sandy, September 14; Fort Benton, September 20. Idaho, Deer 

 Flat Refuge, November 1; Meridian, December 14. Wyoming — 

 Hutton Lake, October 5; Midwest, October 7; Wheatland, November 

 2. Colorado (winters rarely) — Boulder County, October 13; Jackson 

 County, October 26; El Paso County, November 2. Manitoba — 

 Treesbank, September 25; Oak Lake, October 4. North Dakota — 

 Stump Lake, September 29; Jamestown, October 1. South Dakota — 



