. NORTHERN VIOLET-GREEN SWALLOW. _Tachycineta thalassina lepida._

Range.--United States in the Rocky Mountains and west to the Pacific
coast, breeding from Mexico to British Columbia; winters south of our
borders.

This very beautiful species is smaller than the last, but, like it, is
white below, but the upper parts are blue, green and purple without
gloss. They are common in their range and nest, usually in holes in
trees, less often in banks and under eaves; the nests are made of grass
and feathers, and the eggs are pure white, four or five in number; size
.72 x .50.

615a. SAN LUCAS SWALLOW. _Tachycineta thalassina brachyptera._

Range.--Southern Lower California. Practically the same bird as the last
but with the wing very slightly shorter. Nesting habits or eggs will not
differ.

615.1. BAHAMAN SWALLOW. _Callichelidon cyaneoviridis._

Range.--Bahamas; casual at Dry Tortugas, Florida.

This very beautiful species is similar to the western Violet-green
Swallow, as are also its eggs.

616. BANK SWALLOW. _Riparia riparia._

Range.--Whole of North America, north to the limit of trees, breeding
from the middle portions of the United States northward; winters south
of our borders.

This dull-colored Swallow is grayish above and white below, with a gray
band across the breast, they breed in holes in embankments, digging
small tunnels from one to three feet in length, enlarged and lined at
the end with grass and feathers. During May, June or July, according to
latitude, they lay from four to six pure white eggs; size .70 x .50.

617. ROUGH-WINGED SWALLOW. _Stelgidopteryx serripennis._

Range.--United States, breeding from Mexico north to southern New
England, Manitoba and British Columbia; winters south of our borders.

This species is slightly larger than the last and similar but with the
throat and breast grayish and with the outer web of the outer primary
provided with recurved hooks. They nest in holes in embankments, in
crevices in cliffs or among stones of bridges or buildings. Their eggs
are like those of the Bank Swallow but average a trifle larger; size .75
x .52.

[Illustration 376: White.]
[Illustration: White.]
[Illustration: 615--616.]
[Illustration: White.]
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[Illustration: left hand margin.]

Page 375

WAXWINGS. Family AMPELIDAE

618. BOHEMIAN WAXWING. _Bombycilla garrulus_.

Range.--Breeds in the Arctic regions except in the Rockies where it
nearly re