148 



BAY-BEEASTED WAEBLEE. 



660. Dendroica castanea. S T / 2 inches. 



Male, with crown, throat and sides rich chestnut; 

 female, paler; young and adults in winter, greenish 

 above, streaked with black and with a trace of chest- 

 nut on the flanks. 



These Warblers are only locally abundant during 

 migrations, while in eastern New England they are 

 rare. They are active insect hunters, darting rapidly 

 about the tree tops or, less often, in brush; their habits 

 most nearly resemble those of the Chestnut-sided 

 Warbler. 



Song. A low, liquid warble. 



Nest. At low elevations in trees in swampy woods; 

 compact, cup-shaped structures made of fine shreds of 

 bark, rootlets and grass; eggs bluish white, finely 

 specked around the large end with reddish brown 

 (.70x.50). 



Eange. Eastern N. A., breeding from the northern 

 edge of the U. S. northward; winters south of the 

 U. S. 



