654. Dendroica caerulescens 
BLACK-THROATED BLUE WARBLER. 5 inches 
Male. Above dark grayish blue; whzte patch on wings and white 
spots on tail. Below, throat and sides black; breast white. Female. 
Above dark olive. Below yellowish white ; wing patch white. 
A bird of the woods. Migrant in Massachusetts. Arrives about 
May 10. 
Song. Zee, zee, zee, loudly and slowly on an upward scale. 
Nest. In bushes near the ground in dense woods. In elevated 
portions of southern New England it nests in mountain laurel. 
Breeds. Throughout New England, very sparingly in the south- 
ern part, and only where there is mountain laurel. 
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