WESTERN" SOLITARY SANDPIPER 15 



coast to the tableland, arriving from the north at least as early as 

 August 10." Dr. Alexander Wetmore (1926) says: 



The specimens taken at Formosa and General Roca belong certainly to the 

 western form, on the basis of size (male, wing, 134.3; female, wing 136.7 mm.), 

 dorsal coloration, and the presence of mottling on the inner web of the outer 

 primary. A female from Lazcano, Uruguay, has molted the outer primaries, 

 but on the basis of other measurements and on the presence of some dark, buff 

 mottling on the back seems v\-ithin the limit of variation of cinnamomea and 

 is identified as tlie same as the other two. Though the typical subspecies 

 solUaria is recorded definitely from Colombia by Chapman, these findings seem 

 to cast a doubt on its presence as far south as Argentina. 



DISTRIBUTION 



Range. — Western North America and South America. 



Breeding range. — No unquestioned set of eggs of the western soli- 

 tary sandpiper has thus far been recorded. Downy young with their 

 parents have, however, been taken in western Alberta (Henry House) 

 and in Alaska (Circle, Kowak River, Eagle, and Charlie Creek). 

 There also is a strong probability of their breeding in British Co- 

 lumbia (Cariboo District, and Ducks). 



Winter range. — As mentioned under T. s. solitaria., the two races 

 of this species on their wintering grounds in South xVmerica have 

 been distinguished only on a few occasions. It is probable that they 

 either occupy the same winter grounds or that their ranges overlap. 

 All specimens collected by Wetmore (1926) from Uruguay, Paraguay, 

 and Argentina, prove to be this form, indicating that it may winter 

 south of true solitaria. It also has been taken by Chapman in 

 Ecuador (Guayaquil, Loja, and Cebollal). 



Spring iiiigroMon. — Early dates of spring arrival are : Texas, Sam- 

 uels, April 15, and Henrietta, April 19 ; New Mexico, State College, 

 May 4, and Las Vegas, May 8; Colorado, Colorado Springs, May 1, 

 Denver, May 4, and Boulder, May 5 ; Montana, Terry, May 7, and 

 Billings. May 10; Alberta, Athabaska Landing, May 5, Edmonton, 

 May 10, and Sandy Creek, May 14; Mackenzie, Fort Simpson, May 

 10, and Fort Providence, May 14; Arizona, Verde Valley, April 20, 

 and Paradise, May 9; California, Los Angeles, April 10, Gridley, 

 April 23, and Fort Crook, May 4; Oregon, Anthony, April 16, and 

 Malheur Lake, April 17; Washington, Tacoma, May 6; British Co- 

 lumbia, Okanagan Landing, May 5, and Chilliwack, May 7; Yukon, 

 Forty-mile, May 8; and Alaska, Tocatna Forks, May 12, Nulato, 

 May 15, and Kowak River, May 18. 



Late dates of spring departure are: Colorado, Boulder, May 25, 

 Denver, May 28, and Grand Junction, June 3; and Wyoming, Fort 

 Saders, Mav 25. 



