PILEOLATED WiEBLEE. 129 



Mount Popocatapetl and 11,000 feet on the mountains of western 

 Guatemala. At the same time it is not uncommon on the coast itself 

 as far north as the city of Vera Cruz and also on the Pacific coast in 

 Chiapas, Colima, etc. The pileolated warbler follows the main chain 

 of the mountains southeast until it is fully as far east as the birds from 

 the eastern United States. Collections of Costa Kican birds contain 

 typical examples of this form; one of the specimens taken by Arce at 

 the volcano of Chiriqui" in Panama, now in the National Museum, is 

 certainly a western bird; and those taken by Bi'own' in Panama dur- 

 ing 1901 are also undoubtedly western. 



Spring migration. — The first pileolated warblers have been noted in 

 southern Arizona April 12, 1902; at Loveland, Colo., May 11, 1889, 

 and at Great Falls, Mont., May 23, 1892. 



Fall migration.. — Returning migrants have been seen at Great Falls, 

 Mont., August 17, 1889, and at Cheyenne, Wyo., August 25, 1884. 

 They enter Mexico so early that parties of the Biological Survey met 

 them on August 20, 1894, in Oaxaca, and on September 4, 1893, in the 

 Valley of Mexico. It was probably the western birds that Cherrie 

 noted in Costa Rica as first arriving on October 27, 1889, becoming 

 common by November 20, outnumbering all other warblers during 

 December, and being last noted March 6, 1890. In 1902 Carriker " 

 found thpm until April 12 in Costa Rica. 



685b. Wilsouia pusilla chryseola Eidgw. Golden Pileolated Warbler. 



Breeding range. — This is the Pacific coast form of pusilla, and 

 breeds from southern California to British Columbia. Specimens 

 have been taken east to Arizona and Fort Klamath, Oregon. 



Winter range. — The winter home is in Mexico, at least as far south 

 as Chihuahua, Sonora, and Cape St. Lucas. 



Spring migration. — The birds enter the United States in southern 

 California during the first ten days of March, are passing central Cal- 

 ifornia during the last week of the month, and arrive in southern 

 British Columbia in the first week in May. 



Fall migration. — Records of the beginnings of fall migration are 

 lacking. A belated bird was noted at Chilliwack, British Columbia, 

 November 17, 1888. 



686. 'Wilsonia canadensis (Linn. ). Canadian Warbler. 



Breeding range. — ^The name of this warbler indicates its principal 

 breeding range, which extends north to Newfoundland, southern Lab- 

 rador. Hudson Bay, Cumberland House on the Saskatchewan River, 

 Edmonton, Alberta, and Fort McMurray, Athabasca. South the Cana- 



«Salvin, P. Z. S., p. 183, 1870. 



6 Bangs., Proc. N. E. Zool. Club, III, 61, 1902. 



« Specimens in Carnegie Museum, Pittsburg, Pa. 



6152— No. 18-04 9 



