Semi-Pensile, Pensile or Hanging Nests 
627. Warbling Vireo: Vireo gilvus (Vieill.) 
Adult—Upper parts olive green or grayish green; under parts 
white, slightly tinged with yellow; line over the eye indis- 
tinct grayish white. Length—5.8o. 
Breeding Range—Throughout the Eastern States. 
The nest is similar to that of the red-eyed vireo; the eggs 
white, spotted and sometimes blotched with reddish brown. 
Size—.75 x .52. 
This bird is difficult to distinguish from the red-eyed vireo; 
it is somewhat smaller, the line over the eye less distinct and the 
song totally different, being more prolonged and melodious. 
The breeding season begins towards the end of May. 
628. Yellow-throated Vireo: Vireo flavifrons Vieill. 
Adult—Upper parts yellowish olive; rump gray; ring around 
the eye yellow; breast light lemon yellow; belly grayish 
white; distinct white bars on wings. Length—5.95. 
Breeding Range—Throughout the Eastern States. 
The nest resembles a good example of the red-eyed vireo’s, 
from five to forty feet from the ground. 
Eggs white with a tinge of pink; rather more thickly spotted 
than those of the red-eyed vireo. Size—.83 x .61. 
The bright yellow breast serves to distinguish this bird from 
other members of the vireo family; the breeding habits are not 
very different from those of the red-eyed vireo, except that 
nesting begins rather later. 
629. Blue-headed, or Solitary Vireo: Vireo solitarius 
(Wils.) 
Adult—Upper parts greenish; head blue gray, with conspicuous 
white ring round the eye, and white between eye and bill; 
under parts whitish, tinged on the sides with greenish 
yellow; wings have two white bars. Length—5.61. 
Breeding Range—Chiefly in the northern part of the United States, 
and in the higher parts of the Alleghanies further south; 
rarely in northern New Jersey. 
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