ROCKY MOUNTAIN BLACK-HEADED GROSBEAK 57 



to Guerrero (Amojileca) and Oaxaca (Cerro San Felipe); east to 

 central Nebraska (Greeley) and central Kansas (east to Cloud and 

 Harvey counties), western Oklahoma, western Texas (Midland 

 County), and Tamaulipas (La Joya de Salas). 



Winter range. — Winters from southern Sonora (Alamos), southern 

 Chihuahua (Chihuahua), and Nuevo Leon (Mesa del Chipinque) 

 south to Guerrero and Oaxaca. 



Casual records. — Casual north and east to eastern North Dakota 

 (Fort Totten), western Ontario (Kenora), eastern Missouri (St. 

 Charles County), central Oklahoma (Fort Cobb), and central Texas 

 (Menard, Somerset). Casual in winter in Texas, Arkansas, Louisi- 

 ana, Mississippi, Alabama, Florida, South Carolina, Virginia, Mary- 

 land, Pennsylvania, New Jersey, New York, Connecticut, and 

 Massachusetts. 



Migration. — The data deal with the species as a whole. Early 

 dates of spring arrival are: Nuevo Leon — March 24. Coahuila — 

 Sierra del Carmen, April 13. Baja California — Concepcion Bay, 

 April 2; Agua Verde Bay, April 12. Florida — southern peninsula, 

 April 13. Alabama — ^Booth, May 4. Texas — Kerrville, April 30. 

 Oklahoma — Cheyenne, May 10. Kansas — ^Hayes, April 26 (Kansas 

 median for 17 years. May 5). Nebraska — Superior, April 18. South 

 Dakota — Aberdeen, April 21. Manitoba — Treesbank, May 30. Sas- 

 katchewan — Nipawin, June 6. New Mexico — Chloride, April 28; 

 Los Alamos, May 2 (median of 8 years. May 7). Colorado — Grand 

 Junction, April 20. Utah — Green River, May 6. Wyoming — 

 Torrington, May 12 (average of 11 years. May 21). Idaho — Pot- 

 latch, May 10 (median, May 19). Montana — Fort Custer, May 14. 

 California — San Francisco Bay area, April 2. Nevada — Mercury, 

 April 11. Oregon — Yamhill County, April 27. Washington — Pull- 

 man, May 9; Everson, May 12 (median of 6 years, May 19). British 

 Columbia — ^Victoria, May 1. 



Late dates of spring departure are: Veracruz — Las Vigas, April 24. 

 Sinaloa — Cosala, May 13. Guerrero — Chilpancingo, May 6. Baja 

 California — La Paz, May 4. 



Early dates of fall arrival are: Texas — ^Austin, August 26. Mis- 

 souri — St. Charles County, September 6. Louisiana — ^Bonnet Carre 

 Spillway, October 25. Florida — Pensacola, October 1. Baja Cali- 

 fornia — La Paz, July 22. Sinaloa — October 4. Guerrero — August 26 



Late dates of fall departure are: British Columbia — Okanagan 

 Landing, September 15. Washington — Pullman, September 6; Ever- 

 son, September 5 (median of 5 years, September 3). Oregon — 

 Multnomah, September 28. Nevada — ^Mercury, October 4. Cali- 

 fornia — Point Bonita, October 20, Montana — Gold Creek, Powell 

 County, August 27. Idaho — Potlatch, September 13. Wyoming — 



