fer from those of the other Pewees.

463. YELLOW-BELLIED FLYCATCHER. _Empidonax flaviventris._

Range.--North America, east of the Plains and north to Labrador; winters
south of the United States.

This species is slightly larger than the Least Flycatcher and is more
yellowish above and below, the breast being quite bright. While common
in some districts it is quite shy and frequents thickly wooded regions,
where it is not very often seen. They nest near or on the ground among
rocks or roots of fallen trees, chiefly in swampy places; the nests are
made in bunches of moss, hollowed out and lined with very fine grasses.
Their four eggs are creamy or buffy white, spotted and speckled about
the larger end with reddish brown and gray; size .68 x .51.

464. WESTERN FLYCATCHER. _Empidonax difficilis difficilis._

Range.--Western North America, from the Rocky Mountain region to the
Pacific, and north to Alaska; winters chiefly south of the United
States.

This Flycatcher, which is similar to the last, nests in similar
locations as well as in many others, such as crevices and fissures in
rocks, holes in banks, cavities in trees, rafters in buildings, etc. The
nests are variously made, but consist chiefly of fine grasses, weeds and
fibres. The eggs are as a rule similar to those of the last species and
cannot be distinguished.

[Illustration 295: Yellow-bellied Flycatcher. Acadian Flycatcher.]
[Illustration: Creamy white.]
[Illustration: Creamy white.]
[Illustration: deco.]
[Illustration: right hand margin.]

Page 294

464a. SAN LUCAS FLYCATCHER. _Empidonax difficilis cineritius._

Range.--Lower California.

This species is similar to, but duller in plumage than the Western
Flycatcher. Their nesting habits do not probably vary from those of the
latter.

465. ACADIAN FLYCATCHER. _Empidonax virescens._

Range.--Eastern United States, breeding from the Gulf to southern New
England, and in the Mississippi Valley to Manitoba.

This species is very pale below and greenish yellow on the back. They
are among the latest of the migrants to reach our borders and arrive in
the Middle States about the latter part of May, when they are quite
common. They build semi-pensile nests in the forks of bushes or
overhanging branches at heights of from four to twenty feet, the nests
being made of rootlets, fibres, fine grasses, etc., and partially
suspended from the branch; they are quite shallow and loosely
constructed and of