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The Singing of Birds. B.P.Blokneil. 



Dendrceca cserulescens. Black-throated Blue 

 Warbler. 



Passes by in full song in May. Though usually silent on its 

 migration in the autumn, it is sometimes to be numbered among 

 the birds which sing at that season. On September 23, 1878, a 

 morning when birds were abundant and active, and a number 

 voiceful, including the House Wren, Blue-headed and White- 

 eyed Vireos, Swamp and Song Sparrows, several of these 





Warblers were observed in fine plumage and full song. It 

 arrives in autumn with renewed plumage and usuallj- with little 

 fat. 



Dendrceca coronata, Yellow-rumped Warbler ; D. maculosa, 

 Black-and-yellow Warbler ; D. feiinsylvanica^ Chestnut-sided 

 Warbler ; D. castanea, Bay-breasted Warbler ; £). striata, 

 Black-poll Warbler ; D. blackburnice, Blackburnian Warbler ; 

 D. virens. Black-throated Green Warbler ; D. palmarum hyfo- 

 chrysea, Yellow Red-poll Warbler ; D. tigrina. Cape May 

 Warbler. 



All of these spring and autumn migrants sing as they pass 

 north, but are silent when they return. 



Auk, I, July. 1884. Ji/ 3 



