Range.--Salt Marshes of San Francisco Bay, California.
=682. Belding Yellow-throat= (_Geothlypis beldingi_). L. 5.7. _Ad._ [Male]. Black mask crossing head diagonally bordered behind by yellow; rest of plumage much as in No. 681a. _Ad._ [Female]. Similar to [Male] of No. 681, but larger.
=682.1. Rio Grande Yellow-throat= (_Geothlypis poliocephala_). L. 5.7. _Ads._ Lores and forehead black, crown gray, back olive-green; underparts yellow.
Range.--Lower Rio Grande Valley in Texas and southward into Mexico.
=645. Nashville Warbler= (_Helminthophila rubricapilla_). L. 4.8. No wing-bars; no white in tail. _Ad._ [Male]. A chocolate crown-patch; rest of head and cheeks bluish gray; a white eye-ring; back olive-green; below bright yellow. _Ad._ [Female]. Similar, but little or no chocolate in crown; yellow duller. _Yng._ Head brownish; underparts washed with brownish, particularly on throat and flanks. _Notes._ Song, _ke-tsee-ke-tsee-ke-tsee-chip-ee_, _chip-ee-chip-ee-chip_, first half like Black and White Warbler's, second half like Chipping Sparrow's. (Langille.)
Range.--Eastern North America; breeds from southern New York, Connecticut, and northern Illinois, north to Labrador and Hudson Bay region; winters south of United States.
=645a. Calaveras Warbler= (_H. r. gutturalis_). Similar to No. 645, but rump brighter; underparts richer yellow.
Range.--Western United States; breeds on high mountains, from the Sierra Nevada to British Columbia, east to eastern Oregon, northern Idaho; south in migration to Lower California and Mexico; southeast to Texas. (Ridgw.)
=648. Parula Warbler= (_Compsothlypis americana_). L. 4.5; W. 2.3. _Ad._ [Male]. Above grayish blue, a _yellowish patch in the back_; breast yellow washed with chestnut and with an indistinct blackish band; belly, wing-bars, spot near tip of outer tail-feathers white. _Ad._ [Female]. Paler, breast without black, sometimes no chestnut. _Notes._ A short, little, guttural, lisping trill.
Range.--Breeds in south Atlantic and Gulf states east of Texas north near the Atlantic coast to the District of Columbia and Mount Carmel, Illinois (Brewst.); winters from Gulf States southward.
=648a. Northern Parula Warbler= (_C. a. usneæ_). Similar to No. 648, but bill averaging slightly smaller, the wing longer, 2.4; black breast-band averaging wider; the chestnut wash stronger.