WARBI.KR SONGvS 3 



what simplifying the process of study. If this paper should 

 prove of any assistance to lay ornithologists, and to those who 

 find pleasure in casual notice of birds, the labor of preparing 

 it will be fully repaid. 



Acknowledgements are gladly made to Mr. H. W. Carriger, 

 Sonoma, Calif. ; Mr. N. Hollister, Delavan, Wis. ; Miss Ethel 

 Dane Roberts, Wooster, Ohio ; and Mr. Benj. T. Gault, Glen 

 Ellyn, 111., for valuable manuscript notes upon original field 

 work. Particularly to Mr. Frank L. Burns, Berwyn, Pa., for 

 painstaking study of several species not accessible to the 

 writer, and for constant interest and encouragement when the 

 future of the study looked dark and forbidding. Most of all 

 are thanks due Professor Albert A. Wright for constant en- 

 couragement, and for patience and forbearance with me during 

 " warbler time," when the many voices from the tree-tops 

 proved more alluring than the duties which rightly called my 

 attention away from the birds. Finally, it is with real pleasure 

 that the writer reminds the reader of the close companionship, 

 so often more than hinted in former numbers of this Bulletin, 

 between himself and Rev. W. L. Dawson, now of Ahtanum, 

 Washington ; a fellowship to which the paper now presented 

 owes far more than appears upon its pages. 



While the serial arrangement of the species* does not follow 

 that adopted by the American Ornithologists' Union, the 

 nomenclature does. The number following the name of the 

 species will indicate its systematic position. It has seemed 

 better to group the species according to their songs rather 

 than according to their structural relationships. The geo- 

 graphical range, which always closes the discussion of each 

 species, has been taken bodily from the A. O. U. Check List 

 of North American Birds. 



