BIRDS OBSERVED AT CAMBRIDGE, MASS. 57 



Barn Swallow. Common Summer Resident, but fast de- 

 creasing-, April 20 to September 10. 



Cliff Swallow. Summer Resident, much less common than 

 formerly, April 28 to September 1. 



Bank Swallow. Common Summer Resident, April 28 to 

 September 1. 



Tree Swallow. Summer Resident, formerly common, now 

 common only as a migrant, April 5 to October 12. 



Purple Martin. Locally common Summer Resident, April 

 20 to August 25. 



Cedar Wax wing. Not common Permanent Resident ; 

 common Summer Resident ; abundant Transient Vis- 

 itant, in spring, February 1 to April 25. 



Northern Shrike. Common Winter Visitant, November 1 

 to April 1. 



Red-eyed Vireo. Abundant Summer Resident, May 10 to 

 September 10. 



Warbling Vireo. Common Summer Resident, May 10 to 

 September 25. 



Yellow-throated Vireo. Common Summer Resident, May 

 8 to September 1. 



White-eyed Vireo. Rather rare Summer Resident, May 8 

 to September 20 ; formerly common. 



Black and White Warbler. Very common Summer Resi- 

 dent, April 25 to September 5. 



Yellow Warbler. Abundant Summer Resident, May 1 to 

 September 30. 



Myrtle Warbler. Abundant Transient Visitant, April 18 

 to May 20 ; September 20 to November 3 ; a few 

 winter. 



Black-throated Green Warbler. Very common Summer 



Resident, May 1 to October 15. 



Redstart. Very common Summer Resident, May 5 to Sep- 

 tember 20. 



Oven-bird. Abundant Summer Resident, May 6 to Sep- 

 tember 15. 

 Maryland Yellow-throat. -Abundant Summer Resident, 



May 5 to October 20. 



Chat. Rather rare Summer Resident, May 15 to (?). 

 18 



