82 BULLETIN 17 0, UNITED STATES NATIONAL MUSEUM 



Washington (Quilcene, Seattle, and Smith Island); and British 

 Columbia (Okanagan). 



The range above outlined combines the four races currently recog- 

 nized as North American. The eastern pigeon hawk (Falco columbarius 

 columbarius) breeds in the eastern part of the range west to the eastern 

 border of the Great Plains and winters south through the West Indies 

 and eastern Mexico to northwestern South America. The black 

 pigeon hawk (F. c. suckleyi) is found during the nesting season only 

 on the coastal islands of southern Alaska and British Columbia, 

 wintering south rarely as far as San Francisco Bay. Richardson's 

 pigeon hawk (F. c. richardsoni) occupies the Great Plains region from 

 southern Alberta and Saskatchewan south in winter through Colo- 

 rado and New Mexico to Texas and probably northwestern Mexico. 

 The western pigeon hawk (F. c. bendirei) breeds from northern 

 Alaska, Yukon, and western Mackenzie south to Saskatchewan, 

 Alberta, and British Columbia and through the mountains to northern 

 California, wintering south through California to New Mexico, 

 northern Mexico, and Baja California. 



Spring migration. — Early dates of arrival north of the winter range 

 are: New Brunswick — Scotch Lake, April 2; St. John, April 7. Nova 

 Scotia — Pictou, March 26. Prince Edward Island — North River, 

 April 16. Newfoundland — Placentia Bay, February 13. Wisconsin — 

 Milwaukee, March 10; Elkhorn, March 15; Whitewater, March 17. 

 Minnesota — Cottonwood County, March 20; Heron Lake, March 27; 

 Wilder, April 2; White Earth, April 12. South Dakota — Vermillion, 

 March 11; Brookings, March 22; Yankton, March 25. North Da- 

 kota — Argusville, March 25; Larimore, April 6; Bathgate, April 9. 

 Manitoba — Margaret, March 31 ; Killarney, April 1 ; Treesbank, April 

 7; Aweme, April 9. Saskatchewan — Eastend, March 15; South Qu' 

 Appelle, March 18; Skull Creek, March 22; Muscow, March 25. 

 Mackenzie — Fort Simpson, April 25; Fort Providence, April 27. 

 Idaho — Coeur d'Alene, April 16. Montana — Terry, March 7; For- 

 tine, April 16 (one seen January 15, 1931). Alberta — Alliance, April 

 11; Nan ton, April 13; Stony Plain, April 15; Fort McMurray, April 

 21. Alaska — mouth of Stikine River, April 19; Kuiu Island, April 25; 

 Strelna, May 8; Ilusbagah, May 10; Fort Yukon, May 13; St. Michael, 

 May 18; Kowak River, May 19. 



The last individuals appear to leave the southern parts of the winter 

 range in March and April. Some late dates of departure from this 

 region are: Virgin Islands — St. Croix, April 28. Puerto Rico — Lajas, 

 April 1. Dominican Republic — Lake Enriquillo, March 5. Florida — 

 Key West, April 3; Pensacola, April 22; Dunedin, April 30. Louisi- 

 ana — Chenier Tigre, March 10. 



Fall migration,. — Late dates of fall departure from the northern 

 parts of the breeding range are: Alaska — Unalaska, September 25; 



