=423. Chimney Swift= (_Chaetura pelagica_). L. 5.4; W. 4.9. Tail with protruding spines. _Ads._ Above sooty, rump and underparts paler; throat whitish. _Notes._ A rolling twitter.

Range.--Eastern North America, west to the Plains; breeds from Florida to Labrador and Manitoba; winters south of United States, to Central America.

[Ill.u.s.tration: 424.]

=424. Vaux Swift= (_Chaetura vauxii_). L. 4.5; W. 4.4. _Ads._ Similar to No. 423, but smaller and somewhat browner. _Notes._ Resemble those of No. 423, but are less frequently uttered. (Bendire.)

Range.--Western United States; breeds on Pacific coast, locally, north to British Columbia; east casually to Montana and Arizona; winters south of United States to Central America.

[Ill.u.s.tration: 425.]

=425. White-throated Swift= (_Aeronautes melanoleucus_). L. 6.5. Tail forked, without spines. _Ads._ Above sooty brownish black; breast, middle of belly and flank patches white. _Notes._ A sharp, metallic twitter.

Range.--Western United States; east to western Nebraska and Black Hills; breeds in Rocky Mountains north to Montana; on Pacific coast north to Lat. 38; winters south of United States to Central America.

Hummingbirds

[Ill.u.s.tration: 426.]

=426. Rivoli Hummingbird= (_Eugenes fulgens_). L. 5.1. A small white spot behind eye. _Ad._ [Male]. Crown purple, throat bright green, back bronzy green; tail somewhat more bronzy. _Ad._ [Female]. Above bronzy green, all but central tail-feathers with blackish ends and narrow grayish tips; below grayish, all but throat feathers _green centrally_. _Yng._ [Male]. Throat with more or less green, belly and above more bronzy than in [Female].

Range.--Nicaragua, north in mountains to mountains of southeastern Arizona, and southwest New Mexico; winters south of United States.

[Ill.u.s.tration: 429.]

=429. Black-chinned Hummingbird= (_Trochilus alexandri_). L. 3.5; W.

1.7. _Ad._ [Male]. Chin and upper throat black, lower throat amethyst; tail forked, feathers pointed. _Ad._ [Female]. Throat grayish white; _chin buffy_; tail feathers more rounded, three outer ones tipped with white. _Yng._ [Male]. Similar [Female], but throat with dusky spots.

Range.--Western United States; breeds from San Antonio, Texas, New Mexico, Arizona, and California north to Montana and British Columbia; rare on Pacific coast north of southern California; winters south of United States.

[Ill.u.s.tration: 430.]

=430. Costa Hummingbird= (_Calypte costae_). L. 3.1. No rusty in plumage. _Ad._ [Male]. Crown, throat and lengthened neck-feathers amethyst, back dull green. _Ad._ [Female]. Below grayish white; above grayish green; outer tail-feathers _gray_ at base, then black and at tip white. _Yng._ [Male]. Similar to [Female], but throat usually with some amethyst spots; tip of outer tail-feather grayish.

Range.--Northwestern Mexico; breeds north throughout Lower California, to southern California, northern Nevada, southwestern Utah, and southwestern New Mexico; winters from Mexican border southward.

[Ill.u.s.tration: 437.]

=437. Lucifer Hummingbird= (_Calothorax lucifer_). L. 3.6; B. .8. _Ad._ [Male]. Throat purplish pink, feathers at its side much lengthened; tail feathers very narrow, the outer ones less than .05 in. wide on end half. _Ad._ [Female]. Below nearly uniform _rusty buff_, above bronzy green; tail-feathers white-tipped.

Range.--"From western Texas and southern Arizona south to the city of Mexico and Puebla." (Bailey.)

[Ill.u.s.tration: 440.]

=440. Xantus Hummingbird= (_Basilinna xantusi_). L. 3.6. A white streak behind eye. _Ad._ [Male]. Chin, forehead and cheeks _black_; throat green; tail rusty brown. _Ad._ [Female]. Below uniform rusty, above green; outer tail-feathers rusty brown.

Range.--Lower California, north to Lat. 29; most common in Cape Region.

[Ill.u.s.tration: 427.]

=427. Blue-throated Hummingbird= (_C?ligena clemenciae_). L. 5.2. A white _stripe_ behind, and a smaller one before eye. _Ad._ [Male].

Throat blue; belly grayish; back green; tail blue-black, outer feathers broadly white tipped. _Ad._ [Female]. Similar but throat dusky gray.

Range.--Southern Mexico north. In mountains to mountains of southwestern New Mexico and southern Arizona; winters south of United States.

[Ill.u.s.tration: 438.]

=438. Reiffer Hummingbird= (_Amazilis tzacatl_). L. 4.1. _Ads._ Above, _throat_ and _breast_ shining green; belly _grayish_; tail square, rusty brown, _narrowly_ margined with coppery. _Yng._ Similar but more rusty above.

Range.--Northern South America; north, rarely, to Lower Rio Grande Valley, Texas.

[Ill.u.s.tration: 439.]

=439. Buff-bellied Hummingbird= (_Amazilis cerviniventris chalconota_). Similar to No. 438, but belly _rusty gray_, tail forked and _broadly_ margined with coppery green.

Range.--Central America, north, in spring, to Lower Rio Grande Valley, Texas.

[Ill.u.s.tration: 440.1]

=440.1. White-eared Hummingbird= (_Basilinna leucotis_). L. 3.7. A white line behind eye. _Ad._ [Male]. Chin, forehead and cheeks _blue_, throat and breast green, tail blackish bronzy green. _Ad._ [Female].

Crown rusty, back bronzy green, below gray spotted with green; outer tail-feathers tipped with gray. _Yng._ [Male]. Similar.

Range.--Nicaragua north, in spring, through mountains to southern Arizona.

[Ill.u.s.tration: 441.]

=441. Broad-billed Hummingbird= (_Iache latirostris_). L. 4. _Ad._ [Male]. Above green; below darker; throat purplish blue; tail darker.

_Ad._ [Female]. Below gray; outer tail-feathers green at base, then bluish black tipped with gray. _Yng._ [Male]. Similar to _Ad._ [Female], but tail blue black with faint gray tips; throat with metallic green feathers.

Range.--Southern Mexico; breeds north through mountains to southern Arizona and southwestern New Mexico.

[Ill.u.s.tration: 428.]

=428. Ruby-throated Hummingbird= (_Trochilus colubris_). L. 3.5; W. 1.5. _Ad._ [Male]. Throat ruby, chin blackish; tail forked, the feathers pointed. _Ad._ [Female]. Throat grayish, tail-feathers rounded, three outer ones tipped with white. _Yng._ [Male]. Like [Female] but throat with dusky spots. (See next page)

Range.--Eastern North America, west to about Long. 100; breeds from Florida and eastern Mexico, north to Labrador and Hudson Bay region; winters from southern Florida to Central America.

[Ill.u.s.tration: 431.]

=431. Anna Hummingbird= (_Calypte annae_). L. 3.6. _Ad._ [Male].

_Crown_ and throat glittering purplish pink; feathers at sides of throat much lengthened. _Ad._ [Female]. Above green; below grayish washed with green; throat usually with pink feathers; tail with a narrow white tip. _Yng._ Similar but browner above.

Range.--Western United States, from northern Lower California north to northern California; east to southern Arizona; south in winter to Mexico; recorded from Guadalupe Island.

[Ill.u.s.tration: 432.]

=432. Broad-tailed Hummingbird= (_Selasphorus platycercus_). L. 4.

_Ad._ [Male]. Outer primary very narrow, end sharp; crown green, throat _pink_; tail green above, purplish below without white tips.