The Migration of Warblers 



SECOND PAPER 



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

 in the Biological Survey 



With drawings* by Louis Agassiz FuerteS and Bruce Horsfall 

 PINE WARBLER 



THE Pine Warbler seems to be the only United States Warbler that 

 breeds at the southern limit of its range, so that its fall migration is a 

 desertion of the northern part of its summer home and a concentra- 

 tion in the southern portion. The winter home is about one-third the area 

 of the breeding range. The Pine Warbler is also the only Warbler breed- 

 ing in the United States, no individuals of which regularly leave the United 

 States in winter. The only records for this species outside of the United 

 States are of a single, probably accidental, occurrence just over the border- 

 line in Mexico, and of stragglers seen occasionally in the Bermudas. 



SPRING MIGRATION 



Atlantic Coast. — The species winters north to North Carolina and south- 

 ern Illinois and the records of spring migration from this winter home are 

 neither regular nor numerous, but the following notes on the arrival of the 

 first birds will give a fair idea of the general movement: 



Lynchburg, Va. , March 30, 1901 ; Washington, D. C, average April 

 3; Renova, Pa., April 18, 1894; Englewood, N. J., April 18, 1900; Port- 

 land, Conn., average April 17; Durham, N. H., average April 26; South- 

 western Maine, average April 20 ; Petitcodiac, N. B., May 19. 1887: Pic- 

 tou, N. S., May 19, 1894; North River, P. E. I., May 2, 1889. 



Mississippi Valley. — Nashville, Tenn., March 24, 1902; Bowling Green, 

 Ky., April 20, 1902; Central Indiana, average April 25 ; Southwestern On- 

 tario, average May 4; Ottawa, Ont., average May 17; St. Louis. Mo., 

 April 21, 1883, April 16, 1888; Southwestern Iowa, average April 27; 

 Lanesboro, Minn., average May 2; Aweme, Man., May 21, 1902. The 

 most northern known extension is to Fort Carlton, Saskatchewan. 



FALL MIGRATION 



The last Pine Warbler seen at Aweme, Man., in 1902, was on Septem- 

 ber 2; the average of the last seen in southwestern Maine, is September 25, 

 and the latest October 4, 1896. The earliest migrants reach Washington, 

 D. C, the last week in August, and the rear guard passes central Indiana 

 and Washington between October 10 and 20. 



*The drawings are one-half natural size 

 (21) 



