34 Fry, Seasonal Decline in Bird Song. [13*11. 



somewhat, but it was a slight change at best. The diminution was 

 rapid from the fourteenth to the twenty-fourth, and after that 

 only an occasional gurgle or phrase of song was heard, the last 

 record for any song at all being August 7. The scold notes were 

 heard throughout the period. 



Up to the fifteenth, the Redstart {Setophaga rutidlla) was heard 

 frequently, but by the twenty-second the song had fallen off 

 decidedly. It was noted occasionally till about the twenty- 

 seventh, when an increase set in, and by August 2, the song was 

 once more much in evidence and continued so, though a second 

 decline was under way during the last few days of the period. 



The Scarlet Tanager {Piranga erythromelas) was in full, rich song , 

 till about July 16, though further study may show this date inac- 

 curate by several days. From that time on the song declined 

 steadily and the last one was recorded on the twenty-seventh. 

 The "chip-churs" were heard throughout the period. 



The Wood Thrush {Hylocichla mustelina) was singing on every 

 hand the first sixteen days. About the seventeenth a slight 

 diminution was apparent which rapidly increased, and after the 

 twenty-fifth the species was comparatively silent, though occa- 

 sional, soft, short songs were heard at intervals as late as August 7. 

 The "whit-whit" calls were heard daily. 



The Yellow Warbler (De?idroica oestiva oestiva) began its song 

 decline with the Wood Thrush on the seventeenth, and was heard 

 less and less till the twenty-third, when the diminution ceased. 

 Between this date and the thirtieth it sang occasionally and then 

 began to increase, and by August 3 it was again singing quite 

 frequently, though not as much as during the first part of July. 

 It was still in this semi-revived period when the studies ceased, 

 August 10. 



The Maryland Yellow-throat (Geothlypis trichas trichas) started 

 its decline with the above two species on the seventeenth, but the 

 diminution in this case was remarkably rapid, and the last song 

 was recorded on the twenty-second, and that performance was 

 short and feeble. 



The Crested Flycatcher (Myiarchus crinitiLs) was often heard 

 calling in the woods through the early part of July. After the 

 tenth the rapidly repeated roll calls became less frequent, and the 



