)8 The Wilson Bulletin — No. 02. 



Canadian Warbler — Twif-fi'.'cc-cc-rc-chicc-clicc-chcc-chcc. 



Chestnut-sided Warbler — CJwc-chcc-chcc-chcc-chcc-chcc- 

 chee, a clear, well accented warble, like the song of Redstart. 

 The syllables proceed in rising cadence up to the fourth 

 syllable, the last two being strongly accented. 



The notes used in this article have been very courteously 

 put at my disposal by the department of zoology of the Field 

 Museum of Natural History, and many of these have been 

 furnished by the following persons to whom I take great 

 pleasure in expressing my thanks : 



Mr. E. E. Armstrong, Chicago ; Mr. Henry K. Coale, 

 Highland Park; Mr. F. S. Daggart. Oak Park; Air. Ruthven 

 Deane, Chicago; Mr. J. L. De Vine, Chicago; Mrs. J. V. Far- 

 well, Jr., Lake Forest ; Mr. B. T. Gault, Glen EUyn ; Miss 

 Juliette Goodrich, Chicago ; Miss Mary E. Schanck, Liberty- 

 ville ; Mr. Jesse L. Smith, Highland Park ; Dr. R. M. Strong, 

 Chicago; Mr. H. S. Swarth, Chicago; Mr. S. S. Visher, 

 Chicago ; Mr. F. M. Woodruff, Chicago. 



Most of the above persons are amateurs, but are careful 

 observers, while six collectors are included in this list, so that 

 the records upon which this article are based can be con- 

 sidered reasonably accurate. The writer has also included his 

 own records which were secured through daily observations 

 and considerable collecting. 



Prof. Wells W. Cooke has kindly furnished the notes on 

 "Average date of last one seeir" from the records of the U. S. 

 Biological Survey. Mr. Gault furnished me with a most 

 valuable list giving the average date when many species were 

 first seen and has kindly consented to correct the proof of 

 this article, owing to the writer's absence from this country. 



