JTor Ceactjerg ana ^tutientfi^ 



The Migration of Warblers 



FIFTH PAPER 



Compiled by Professor W. V/. Cooke, Chiefly from Data 

 in the Biological Survey 



With drawings by Louis Agassiz Fuertes and Bruce Horsfall 



YELLOW-THROATED WARBLER 



Wintering abundantly in southern Florida and sparingly north to South 

 Carolina, but little can be said of the migration of the Yellow-throated 

 Warbler in the Gulf States. The northward movement begins early in 

 March and the average date of arrival for fifteen years at Raleigh, N. C, 

 is March 26, earliest March 13, 1890; the average at Asheville, N. C, for 

 four years is April 21, the earliest April 13, 1893. 



The Yellow-throated Warbler is one of the very earliest fall migrants, 

 beginning its southward movement before the middle of summer and reach- 

 ing Cuba the latter part of July. The last noted at Washington, D. C, 

 was September 4, 1890; at Raleigh, N. C, September 17, 1886, and 

 many migrants continue to pass through Florida during the whole month 

 of October. 



SYCAMORE WARBLER 



This Mississippi Valley form of the Yellow -throated Warbler arrives on 

 the north coast of the Gulf of Mexico about March 10, and spends a 

 month in moving slowly north to St. Louis, Mo. Central Indiana is 

 reached about the middle of April, and the average date of arrival for ten 

 years at Petersburg, Michigan, is April 21. 



The southward migration begins so early that the Sycamore Warbler 

 appears in Guatemala by the middle of August. The last do not leave 

 Indiana and Missouri until October. 



GRACE'S WARBLER 



Grace's Warbler spends the winter in northern Mexico and breeds 

 north to La Plata county, Colorado, but the only migration record I have 

 is of its arrival April 27, 1902, in the Huachuca Mountains of Arizona. 



BLACK-THROATED GRAY WARBLER 



The species enters southern California the first week in April and 

 reaches southern British Columbia the third week in the month. The 



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