WILLIAMSON'S SAPSUCKER 161 



Lake, Lake Talioe, Lassen Peak, and Eagle Peak) ; western Oregon 

 (Eogue River Valley and Foley Springs) ; and west-central Washing- 

 ton (Bumping Lake). 



Winter range. — In winter the species is regularly found north to 

 central California (Yosemite Valley) ; central Arizona (Pine 

 Springs, Oak Creek, and Mogollon Mountains) ; southwestern New 

 Mexico (Black Range); and central Texas (San Angelo). East 

 to Texas (San Angelo and probably Kerrville) ; eastern Chihuahua 

 (Apache) ; and Jalisco (Bolanos and Guadalajara). South to south- 

 ern Jalisco (Guadalajara). West to Jalisco (Guadalajara); north- 

 western Durango ; western Chihuahua (Refugio, Casa Colorado, Ba- 

 vispee River, and Colonia Garcia) ; northern Baja California (San 

 Pedro Martir, Ville de la Trinidad, and Hanson Lagoon) ; and 

 California (Pasadena and Yosemite Valley). 



As outlined, the range applies to the entire species, which has been 

 separated into two subspecies. True Williamson's sapsucker {/S. t. 

 ihyroideus) is found in the Pacific coast region from British Co- 

 lumbia south to Baja California, while Natalie's sapsucker {S. t. 

 nataliae) inhabits the Rocky Mountain region from Montana south 

 to Jalisco. 



Spring migration. — Although the species appears to be resident 

 throughout considerable portions of its range, and but little is known 

 of its migratory movements, the following early dates of arrival 

 have been noted: Colorado — Boulder County, April 5; Colorado 

 Springs, April 5; Evergreen, April 8; Denver, April 15. Wyo- 

 ming — Yellowstone Park, April 29. Montana — Charcoal Gulch, 

 April 23. Nevada — Carson City, March 10. Washington— Pullman, 

 April 26. A late date of departure from the southern part of the 

 winter range is Chihuahua, Palomas Lakes, April 7. 



Fall migration. — Available late dates of fall departure are : Wash- 

 ington — Copper River, September 3. Oregon — Rustler Peak, No- 

 vember 6. Nevada — Lee Canyon, October 7 ; Carson City, November 

 27. Montana — Fort Custer, September 9. Wyoming — Yellowstone 

 Park, September 22; Wheatland, October 4. Colorado — Del Norte, 

 September 5; Rio Blanco, September 9; Boulder County, November 

 6. It has been noted to reach Hanson Lagoon, Baja California, on 

 October 11. 



Carnal records. — There are a few records in extreme southern 

 British Columbia, where it may breed occasionally. A pair were 

 collected on April 22, 1913, on Schoonover Mountain, near Okanagan 

 Falls; one was taken at Similkameen in June 1882, while Swarth 

 (1917) records three from Midway. 



Egg <i^«?^e.<f.-— California : 14 records. May 27 to June 26. 



Colorado: 29 records. May 24 to June 24; 15 records, June 1 to 8, 

 nidicating the height of the season. 



