122 BIRDS OF NEW ENGLAND AND EASTERN NEW YORK 



Berkshire County, Mass., northward, and a rather common 

 migrant through southern New England and the lower 



Hudson Valley, passing 

 north in May, and re- 

 turning in September 

 and early October. It 

 is less common as a mi- 

 grant in eastern Massa- 

 chusetts than in western 

 Fig. 20. Black-throated Blue Warbler Massachusetts or in the 



Hudson Valley. In 

 summer it frequents, in the southern part of its range, cool 

 woods of deciduous trees, — beech, maple, and birch, — 

 where its drawling notes are as characteristic as those of 

 the Black and Yellow Warbler in the spruces. 



The song varies somewhat in form and in length : a com- 

 mon form consists of three rather pure notes with a down- 

 ward inflection, followed by a fourth, hoarse note with rising 

 inflection, whee-a whee-a whee-a whee-ee ; another common 

 form consists of one short introductory note and two up- 

 ward hoarse notes, the whole given rapidly. The hoarse 

 drawling character of the last notes will always serve to 

 identify the song. The alarm-note is a rather heavy chuck. 

 The male is unmistakable ; the female and young are 

 rather puzzling birds, unless one can make out the small 

 white spot on the wing, and the whitish line over the eye. 



Yellow Wabblek; Summer Yellowbibd. Dendroica 



CBStiva 



5.10 



Ad. $ . — Entire bird yellow or yellowish ; the crown in good 

 light bright yellow; the upper parts greenish-yellow; wings and 

 tail brownish; the breast streaked with reddish-brown. Ad. 9. — 

 Like the $, but crown not brighter than the back, breast not 

 streaked with reddish-brown. 



