MIGRANTS AND WINTER RESIDENTS. 165 



Wilson' s Warbler : Wilsonia pusilla. 



Upper parts bright olive-green, no marks on wings or 

 tail; black crown-cap; under parts bright yellow. Female 

 and young without black cap. Length 5 inches. May 8 to 

 20; August 28 to September 15. Rather common. 



Canadian Warbler: Wilsonia canadensis. 



Whole upper parts gray; a necklace of black spots 

 across the yellow breast. Female duller. Length 5J4 inches. 

 May 5 to 25; August 7 to September 25. Very common. 



Philadelphia Vireo: Vireo philadelphicus. 



Much like the Warbling Vireo but without spurious 

 primary, and entire under parts are pale greenish-yellow. 

 May to September. Very rare. 



Blue-headed Vireo: Vireo solitarius. 



Upper parts olive-green; top and sides of head bluish 

 gray; eye-ring white; two white wing-bars, and white on 

 tail. Length 5^2 inches. April 10 to May 10; September 

 to October 25. Common. 



* Migrant Shrike: Lanius ludovicianus migrant. 



Upper parts slaty-gray; wings and tail black, the wings 

 with a large white spot, and the outer tail-feathers tipped 

 with white; under parts white. Length 9 inches. August 

 10 to April 5. Rare. 



Tree Swallow; White-bellied Swallow: Tachyci- 

 neta bicolor. 



Upper parts glossy metallic-green; under parts pure white. 

 The young are bluish-gray above, with white on wings. 

 Length 6 inches. April I to May 25; July 10 to September. 

 Common. 



*Wm. Palmer, Auk, July, 1898, p. 244. 



