THE BIRD BOOK 
627a. Western Warbling Vireo. Vireo- 
sylva gilva swainsoni. 
Range. — Western United States, breeding 
from Mexico to British Columbia. 
This species is like the last but said to be 
a trifle smaller and paler color. Its nesting 
habits and eggs are precisely like tho^e of 
the eastern form. 
628. Yellow-throated Vireo. Lanivireo 
fiavifrons. 
Range. — United States east 
of the Plains, breeding from 
the Gulf to Manitoba and 
New Brunswick. 
This handsome bird is 
wholly unlike any others of 
the Vireos, having a bright 
yellow throat and breast; the 
upper parts are greenish and the wings and 
tail gray, the latter with two white bars. They 
are fairly common breeding birds in northern 
United States, placing their handsome basket- 
like structures in forks of branches and at any 
elevation from the ground; the nests are like those of the preceding Vireos but 
are frequently adorned on the outside with lichens, thereby adding materially 
to their natural beauty. The four or five eggs are pinkish or creamy white, 
speckled about the large end with reddish brown. Size .80 x .60. 
Yellow-throated Vireo 
Creamy white 
629. Blue-headed Vireo. Lanivireo solitarius solitarius. 
Range.- — Eastern United States, breeding from southern 
New England and the northern states north to Hudson Bay; 
winters in the Gulf States and southward. 
A beautiful Vireo with a slaty blue crown and nape, greenish 
back, white wing bars and underparts, the flanks being washed 
with greenish yellow; a conspicuous mark is the white eye 
ring and loral spot. They build firm, pensile, basket-like 
White nests of strips of birch and grapevine bark, lined with fine 
grasses and hair, suspended from forks, usually 
at low elevation and often in pine or fir trees 
(of some twenty nests that I have found in 
New England all have been in low branches of 
conifers). Their three or four white eggs are 
specked with reddish brown. Size .80 x .60. 
629a. Cassin’s Vireo. Lanivireo solitarius 
cassini. 
Range. — United States west of the Rockies; 
north to British Columbia. 
Similar to the last but with the back grayish. 
629b. Plumbeous Vireo. Lanivireo soli- 
Range. — Rocky Mountain region, breeding 
from Mexico to Dakota and Wyoming. 
Like the Blue-headed Vireo but with the 
yellowish wholly replaced by leaden gray. 
282 
Blue-headed Vireo 
