CASSIN'S FINCH 289 



Breeding range. — The Cassin's finch breeds from southern interior 

 British Cokimbia (Stuie, Arrow Lake), southwestern Alberta (Water- 

 ton Lakes Park), northwestern, central, and southeastern Montana 

 (Fort Howe in Powder Kiver County), and northern Wyoming (Yel- 

 stone Park, Black Hills) south through eastern Washington and 

 Oregon (west to Cascade Mountains) to interior northwestern Cali- 

 fornia (Horse Mountain, South Yolla Bolly Mountain), interior 

 southern California (San Jacinto Mountains), northern Baja California 

 (Sierra San Pedro Mdrtir), southern Nevada (Charleston Mountains), 

 northern Arizona (Grand Canyon), and central northern New Mexico 

 (mountains near Taos). 



Winter range. — Winters from southern British Columbia (Okanagan 

 Landing), northwestern Montana (Missoula), and northwestern and 

 central eastern Wyoming (Teton County, Converse County) south to 

 coastal and southern California (Berkeley, San Nicolas Island, San 

 Diego), and southeastern Arizona (Tucson), and through the highlands 

 of Mexico to Zacatecas (Jerez) and San Luis Potosi (Charcas). 



Casual records. — Casual east to southeastern Colorado (Fort Lyon), 

 Nebraska (Crawford, Monroe Canyon), and Kansas (Hays), south to 

 Tres Marias Islands, Valley of Mexico, and Veracruz (Orizaba, 

 Mu-ador in June). 



Migration. — Early dates of spring arrival are: Idaho — Moscow, 

 March 11 (median of 11 years, April 8). Montana — Libby, February 

 16 (median of 6 years, April 5). Wyommg — Laramie, February 25 

 (average of 5 years, April 21); Casper, March 10. 



Late dates of spring departure are: New Mexico — Los Alamos, 

 May 15 (median of 7 years, April 25). Colorado — Boulder, May 21. 

 Wyoming — Casper, May 11. 



Early dates of fall arrival are: Colorado — Denver, September 8. 

 Arizona — Tucson, October 21. New Mexico — Los Alamos and Silver 

 City, October 5 (median of 5 years at Los Alamos, November 11). 



Late dates of fall departure are: Montana— Missoula, October 18; 

 Libby, October 6 (median of 6 years, August 27). Wyoming — 

 Laramie, November 1 (average of 5 years, October 12). Arizona — 

 Nogales, November 12. 



Egg dates. — British Columbia: 5 records, April 18 to July 15. 



California: 70 records, May 29 to July 13; 52 records, June 15 to 

 June 29. 



Colorado: 10 records, June 11 to July 10; 5 records, June 20 to 

 June 30. 



