YELLOW WAfiBLER. 55 



iiecordw from the Mississippi Valley are given in tabular form: 



Mississippi Valley records of arrival of yellow warbler. 



Records of average date of arrival farther north are: Brookville, 

 Ind., April 15; Waterloo, Ind., April 25; Wauseon, Ohio, April 26; 

 Cleveland, Ohio, April 28; southern Ontario, May 1; Ottawa, May 7; 

 Petersburg, Mich., April 26; Chicago, Mnj 2; southern Wisconsin, 

 May 6; Keokuk, Iowa, April 30; Grinnell, Iowa, May 1; Lanesboro, 

 Minn., May 7; Aweme, Manitoba, May 14. The birds of the Rocky 

 Mountains arrive considerably later than at corresponding latitudes in 

 the East. Arrival in Colorado is principally during the second week 

 of May; at Cheyenne, W^yo., on May 11; Teriy and Great Falls, 

 Mont., Ma J' 16. Other records in the far North are: Osier, Saskatche- 

 wan, May 17, 1893; Red Deer, Alberta, May 16, 1893; Pelican Rapids, 

 Athabasca, May 18, 1903; near Lake Athabasca, May 17, 1901; Fort 

 Chippewyan, May 24, 1893; Fort Simpson, May 26, 1861, and May 

 21, 1904. 



The records of arrival of the yellow warbler in Texas are important 

 as bearing on the general problem of migration routes in the State, 

 and are as follows: Corpus Christi, April 22, 1891; Refugio County, 

 April 17, 1899; San Antonio, April 15, 1890, and April 16, 1891; 

 Austin, April 16, 1893; Dallas, April 12, 1898, and April 15, 1899; 

 Bonham, April 9, 1886, April 10, 1886, April 8, 1887, April 8, 1889, 

 April 14, 1890, and April 15, 1891, and Gainesville April 18, 1886, 

 and April 13, 1889. 



Some late spring records south of the United States are as follows: 

 Central Ecuador, common in April; Costa Rica, May 1; Vera Cruz, 

 May 6-10, 1894; Cozumel Island, April 18, 1901. 



Mill migration. — The striking characteristic of the records of the 

 fall migration of the yellow warbler is their earliness. Along the 



