BLACK-THROATED GREEN WARBLER 113 



Black-throated Greex Warbler. Dendroica virens 



5.10 



Ad. $. — Back greenish in strong light; wing-bars broad, 

 white ; cheeks and forehead yellow; middle of throat, upper breast, 

 and sides black; belly white, running up into the black area. Ad. 

 9 . — The yellow cheeks duller, tinged with greenish ; black 

 throat almost obscured with gray ; wing-bars white. Im. — Show- 

 ing hardly any black on the throat. 



Nest, from fifteen to fifty feet up in coniferous trees. 



The Black-throated Green Warbler is a common summer 

 resident of most of New York and New England ; in north- 

 ern New Jersey, the lower Hudson 

 Valley, and southwestern Connecticut 

 it occurs only as a migrant. It arrives 

 late in April or early in May ; north- 

 ern individuals occur in September 

 and early October in the mixed 

 flocks of migrating warblers. It is 



the chief inhabitant of the white Fi g- 15 - Black-throated 



. Green H arbler 



pines, where one hears continually 



its wheezy notes. It is also a common resident of the red 

 cedar or savin groves of southern New England and of the 

 spruces of northern New England and New York. In mi- 

 gration it is common in deciduous trees. 



The song of this warbler has two forms, one quicker 

 than the other; they may be written zee zee zu zi and 

 zl zi zi zi zee zu zi. When a male is singing freely, he 

 often keeps up a chipping note through the short intervals 

 between the repetitions of his song. 



The bird is seldom clearly seen, though its notes are so 

 constant, but as it comes to the end of a twig, one gets from 

 below a glimpse of the bright yellow cheeks, the black 

 throat, and the entering angle of white between the block 

 sides. The only other small bird with a black throat and 

 yellow about the head is the Golden-winged Warbler. In 



