Color Key to North American Birds — Part 154

Range.--Western central and southern Texas and south through eastern Mexico to highlands of Guatemala. (Ridgway.)

=667. Black-throated Green Warbler= (_Dendroica virens_). L. 5. _Ad._ [Male]. Throat and breast black; cheeks greenish yellow; back olive-green; wing-bars and tail patches white. _Ad._ [Female] and _Yng._ [Male]. Similar, but throat yellowish; black breast tipped with yellowish; _belly tinged with yellow_; back _without_ black _streaks_. _Yng._ [Female]. Throat and breast yellowish white, little or no black. _Notes._ Song, a droning _zēē_, _zēē_, _zĕ-ēē'_, _zēē_.

Range.--Eastern North America; breeds from Connecticut and northern Illinois north to Nova Scotia and Hudson Bay, and south in Alleghanies to South Carolina; winters in Central America.

=668. Townsend Warbler= (Dendroica townsendi). L. 5.1. _Ad._ [Male]. A black eye-patch bordered by yellow stripes; crown and throat black; back olive-green spotted with black; wing-bars and tail-patches white. _Ad._ [Female]. Eye-patch olive; throat yellow, indistinctly blackish; crown and back olive-green, with few black streaks. _Yng._ Similar, but yellower. _Notes._ Song, _de-de_, _de-de_, _de_, like that of No. 667. (Merrill.)

Range.--Western North America; breeds from mountains of southern California north to Alaska, east to western Colorado; in migrations to western Texas; winters in Mexico.

=669. Hermit Warbler= (_Dendroica occidentalis_). L. 5.1. Underparts _without_ streaks. _Ad._ [Male]. Crown and cheeks yellow; throat black; back gray spotted with black; wing-bars and tail-patches white. _Ad._ [Female]. Crown less yellow; throat yellowish; back olive-gray, usually without spots. _Yng._ [Female]. Similar, but yellower. _Yng._ [Male]. Throat dusky; forehead and cheeks yellow; back olive-green with concealed black spots. Much like Yng of No. 667, but forehead yellower, no streaks below. _Notes._ Song, _zeegle-zeegle-zeegle-zeek_. (Barlow.)

Range.--Western United States; breeds in high mountains from British Columbia to California, and from Pacific Coast district of United States to Rocky Mountains; migrates to Lower California, Mexico, and Guatemala. (Bailey.)

=684. Hooded Warbler= (_Wilsonia mitrata_). L. 5.7. Outer tail-feather with white patches. _Ad._ [Male]. Forehead and cheeks yellow; hindhead extending to breast and throat black; belly yellow; back olive-green. _Ad._ [Female]. Throat yellow, hindhead olive-green usually with black. _Notes._ Call, a sharp _cheep_; song, a gracefully whistled _you must come to the woods, or you wont see me_.