64 NORTH AMERICAN WARBLERS. 



Fall migration. — As would be expected from its northern breeding 

 range, the myrtle warbler is a late fall migrant. It usually reaches 

 Englewood, N. J., September 26; Philadelphia, September 27, and 

 Washington, October 1. At Raleigh, N. C, the average date of its 

 arrival for twelve j^ears is October 16, with extremes of October 11, 

 1886, and October 21, 1885. Not many myrtle warblers reach Florida 

 before November, and the}^ are the last migrants to arrive in Cuba. 

 In 1887 none of the species struck at Sombrero Key lighthouse until 

 November 11, but the next fall they began striking October 3, and 

 were noted also on October 4, 9, and 29, November 4, 10, and 11, and 

 December 1. The first migrants reach northwestern Minnesota about 

 September 8; Lanesboro, Minn., September 22; southern Wisconsin, 

 September 25; Chicago, September 27; Waterloo, Ind., October 3, 

 and St. Louis the first week in October. The average date of fall 

 arrivals for seven j^ears in the vicinity of New Orleans is October 18, 

 with extremes of October 12, 1895 and 1897, and October 31, 1893. 

 This is a little earlier than in corresponding latitudes along the 

 Atlantic coast. The myrtle warblers desert the northern part of their 

 breeding range by the last of August or earl}^ in September, but their 

 southward retreat is so slow that many are still north of the United 

 States until well into October. The last fall migrant was seen August 

 24, 1903, at latitude 65^ near Great Bear Lake; and almost two months 

 later, on October 15, a straggler was seen near latitude 62° on the 

 Mackenzie River. Records of the average date of the last seen are: 

 Aweme, Manitoba, and Parr}^ Sound district, Ontario, October 10; 

 Ottawa, October 23; southern Ontario, October 24; Quebec and North 

 River, Prince Edward Island, October 8; St. John, New Brunswick, 

 October 23. The dates are not much later in the northern United 

 States, where the species has been noted on the average at Lanesboro, 

 Minn., until October 22; Grinnell, Iowa, October 28; Chicago, Octo- 

 ber 23; southern Maine, October 17; central Massachusetts, October 

 19 ; central Connecticut, October 26 ; southeastern New York, Novem- 

 ber 12; Philadelphia, November 9. 



656. Dendroica auduboni (Towns. )• Audubon Warbler. 



Breeding range. — The Audubon warbler replaces the myrtle warbler 

 from the Rocky Mountains to the Pacific. It breeds north to British 

 Columbia, Alberta (Calgary), Montana, and the Black Hills of South 

 Dakota, south to southern California, northern Arizona, and New 

 Mexico, and east to Colorado and western Nebraska. It has occurred 

 accidentally in Pennsylvania and Massachusetts. It nests to an altitude 

 of 11,000 feet. 



Winter range. — While to the eastward the Audubon warbler scarcely 

 winters north to the Rio Grande, yet on the Pacific slope it is found 

 at this season in most of the valleys of California, and a few spend 



