132 Tyler, Call-notes of Migrating Birds. LApril 



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THE CALL-NOTES OF SOME NOCTURNAL MIGRATING 



BIRDS.i 



BY WINSOR M. TYLER, M.D. 



No matter hov^r carefully we watch the land bu-ds in our vicinity 

 during the latter part of the summer with a view of ascertaining 

 when they leave their breeding-ground to begin their southward 

 journey, we rarely see any evidence of migration in Eastern Massa- 

 chusetts before the middle of August. Our first intimation, per- 

 haps, that a species has left us is within a few days of August 15. 

 The Yellow Warbler's song then drops from the summer chorus. 

 This species is common and sings freely until a certain day, — gen- 

 erally between the 10th and 15th of August; after this date we no 

 longer hear the song and we no longer find the bird in the vicinity 

 until weeks later, when a few migrants pass through this region in 

 September. Although the Least Flycatcher's song period is over 

 some time before that of the Yellow Warbler, this bird (the Fly- 

 catcher) lingers on its breeding-ground apparently, for it is not 

 uncommon to find a silent Chebec on any day in August, and, like 

 the Yellow Warbler, Chebecs, as migrants, occur occasionally in 

 September. But before even the Yellow Warbler has left our 

 garden shrubbery, the autumnal migratory flight has been long 



1 Read on Jan. 17, 1916, at a meeting of the Nuttall Ornithological Club. 



