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 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 solitarius plumbeus._

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.

[Illustration: Yellow-throated Vireo.]
[Illustration 384: Creamy white.]
[Illustration: White.]
[Illustration: Blue-headed Vireo.]
[Illustration: left hand margin.]

Page 383

629c. MOUNTAIN VIREO. _Lanivireo solitarius alticola._

Range.--Mountains of Carolina and Georgia; winters in Florida.

Said to be larger and darker than _solitarius_ proper. From all
accounts, the habits, nests or eggs of this species differ in no wise
from many of those of the northern Solitary Vireo, whose nests show
great variations in size and material.

629d. SAN LUCAS VIREO. _Lanivireo solitarius lucasanus._

Range.--Southern Lower California.

Similar to cassini but with the flanks more yellow. Their nesting habits
or eggs will not differ from the others.

630. BLACK-CAPPED VIREO. _Vireo atricapillus._

Range.--Central Texas north to Kansas; winters in Mexico.

This peculiar Vireo has a black crown and sides of head, broken by a
white eye ring and loral stripe; upper parts greenish, below white. They
appear to be fairly common in certain localities of their restricted
range, and nest at low elevations in mesquites or oaks, placing the
nests in forks the same as other Vireos; they are of the ordinary Vireo
architecture, lined with grasses. The three or four eggs are pure white,
unmark