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The Migration of Warblers

FIFTH PAPER

Compiled by Professor w. w. Cooke, chieﬂy (mm Data in the Biological Survey

Wm. drawings by Louis AcAssiz FuER'ris and sauce HDRSFALL

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 lall 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 Nlarch to, 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

. ., l 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 Nlountains of Arizona.

BLACK -THROATED GRAY WARBLER

l The species enters southern California the ﬁrst week in April and l reaches southern British Columbia the third week in the month. The ‘

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