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 Nighthawk. 420. Nighthawk. Chordeiles virginianus virginianus. Range.--North America, east of the Plains and from Labrador to the Gulf of Mexico; winters through Mexico to northern South America. Grayish white. The Nighthawk or some of its sub-species is found in nearly all parts of North America, its habits being the same in all localities. It is of the same size as the Whip-poor-will, from which species it can readily be distinguished by its lack of mouth bristles, forked tail with a white band near the end, and the white band across the primaries, the latter mark showing very plainly during flight. Besides in the country, they are very common in cities, where they will be seen any summer day towards dusk flying, skimming, sailing, and swooping over the tops of the buildings, upon the gravel roofs on which they often lay their eggs. They nest generally on rocky hillsides or in open woods, laying their two eggs upon the top of a flat rock. The eggs are a grayish white color, marbled, blotched and spotted with darker shades of gray. Size 1.20 x .85. 420a. Western Nighthawk. Chordeiles virginianus henryi. Grayish white. Range.--United States west of the Plains. A similar bird to the preceding, but with plumage somewhat more rusty. It frequents the more open portions of the country in its range, its habits and nesting habits being the same as others of the former species; the eggs average a trifle lighter in color. 420b. Florida Nighthawk. Chordeiles virginianus chapmani. Range.--A smaller and paler form found in Florida and along the Gulf coast. No difference can be observed in the nesting habits of this as compared with the northern form and the eggs are indistinguishable.
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NEST AND EGGS OF NIGHTHAWK.
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 420-421. 420c. Sennett's Nighthawk. Cordeiles virginianus sennetti. Range.--A very pale species with little or no tawny; found in the Great Plains from Texas north to the Saskatchewan; winters south of the United States. 421. Texas Nighthawk. Chordeiles acutipennis texensis. Range.--Mexico and Central America, breeding north to southern Utah and California. Grayish white.
422-424. The pattern of the marking of this species is finer and more mottled with rusty than the Nighthawk. Its habits do not differ to any extent from those of the preceding species; they lay their two mottled gray eggs upon the bare ground, often on the dry sand and in arid regions where they are exposed, with no protection, to the scorching rays of the sun. The eggs vary endlessly in extent of markings, some being very pale and others very dark gray, mottled with various shades of gray, brown and lilac. Size 1.10 x .75.
SWIFTS. Family MICROPODIDÆ 422. Black Swift. Cypseloides niger borealis. Range.--Mountain ranges from Central America north to British Columbia, locally distributed throughout its range. The plumage of this Swift is entirely sooty black, darkest above; the tail is slightly forked and is without spines; length of bird, 7 inches. Although the general habits of this species are well known, little is known of their nesting; they are seen during the breeding season about the higher ranges throughout their United States habitat, and are supposed to nest in crevices on the face of cliffs at a high altitude.
Page 269 Chimney Swift. 423. Chimney Swift. Chætura pelagica. Range.--North America east of the Plains, breeding from central Canada, south to the Gulf coast, and wintering south of our borders. This well known species is sooty brownish black, 5.5 inches long, and has the tail feathers terminating in sharp spines. They are very abundant in all portions of their range, and may be seen on the wing at all hours of the day, but especially abundant in the early morning and toward dusk. They formerly dwelt and bred only in hollow trees, and a great many still continue to do so, as large hollow stumps are known where hundreds nest every year. The majority of the eastern Chimney Swifts now nest in old chimneys that are unused, at least during the summer; some small chimneys contain but a single pair while other large ones may have from fifty to a hundred or more nests glued to the sides. The birds are on the wing during the greater part of the day, generally not frequenting the vicinity of their nesting site, but returning toward dusk, when they may be seen to, one at a time, dive headforemost into the tops of chimneys.
NEST AND EGGS OF CHIMNEY SWIFT.





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 425--426. White. The nest is made of small twigs firmly glued to the sides of the chimney, or tree, and to each other, with the glutinous saliva of the bird, making a narrow semi-circle platform for the reception of their three to five white eggs which are deposited in May or June; size .75 × .50. 424. Vaux's Swift. Chætura vauxi. Range.--Western United States, chiefly west of the Rockies; breeding north to British Columbia, and wintering south of the United States. White. Similar to the last but smaller (length 4.5 inches), and paler in color, fading to white on the throat. The habits of this species are like those of the eastern Chimney Swift, except that the majority of these species still continue to use hollow trees as nesting places. The eggs are just like those of the last bird. 425. White-throated Swift. Æronautes melanoleucus. Range.--Western United States south of Canada, and chiefly in the Rocky Mountains, and in California ranges, north to Lat. 38°. White. A handsome species, 6.5 inches in length, with blackish upper parts and sides, and white throat, breast and central line of under parts, flank patches and ends of secondaries; tail feathers not spined or stiffened. These birds are fairly common in some localities within their range, but appear to be found only on high ranges or in their immediate vicinity. They nest in crevices and caves in the face of cliffs, making a nest similar in construction to that of the Chimney Swift but of weed stalks instead of twigs, and lined with feathers. They lay four or five dull white eggs, during June or July; size .85 × .50.
Page 271 HUMMINGBIRDS. Family TROCHILIDAE Hummingbirds have been truly called "Winged Gems." They are the smallest of birds, the usual plumage being a metallic green with throat or crown patches of the brightest of iridescent shining red, orange, blue or violet. 427--429. Their nests are marvels of architecture being compactly and intricately made of plant fibres and downy feathers ornamented in some cases with lichens. Their flight is accompanied by a peculiar buzzing sound produced by their rapidly vibrating stiffened wing feathers. Their food is small insects and honey both of which they get chiefly from flowers. 426. Rivoli's Hummingbird. Eugenes fulgens. Range.--Mexico, north in summer to southern Arizona where they breed at high elevations in the Huachuca Mountains. This is one of the most gorgeous of the Hummers having the crown a violet purple color, and the throat brilliant green. This species saddles its nest upon branches often at heights of 20 or 30 feet from the ground. They are made of plant down and generally decorated with lichens on the outside, similar to nests of the Ruby-throat. The two white eggs measure .65 × .40. 427. Blue-throated Hummingbird. Cyanolæmus clemenciæ. Range.--Mexico, north in summer to the border of Arizona and western New Mexico. This species is the largest of North American Hummers being 5.25 inches long, this being slightly larger than the preceding. As the name implies, it has a patch of blue on the throat, the upper parts being a uniform greenish; the outer tail feathers are broadly tipped with white. Their nests, which are placed upon the limbs of trees, are made of mosses and plant fibres covered with cobwebs. The two eggs are laid during July and August, and measure .65 × .40.



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FEMALE RUBY-THROATED HUMMINGBIRD ON NEST.
Page 273 Ruby-throated Hummingbird. 428. Ruby-throated Hummingbird. Archilochus colubris. Range.--North America east of the Plains and north to Labrador. This is the only representative of the family found east of the Mississippi. It is a small species, 3.5 inches long, with greenish upper parts and a bright ruby throat. Its nest is as beautiful, if not more so, than that of any other species. They build their nests on horizontal limbs of trees at any height from the ground, but usually more than six feet. Branches an inch or more in diameter are usually selected, they not being particular as to the kind of tree, but oaks, pines and maples perhaps being used the most often. The nests are made of plant fibres and down, and the exterior is completely covered with green lichens so that it appears like a small bunch of moss on the limb. The two white eggs are laid in May or June; size .50 × .35. 429. Black-chinned Hummingbird. Archilochus alexandri. Range.--North America west of the Rocky Mountains; north to British Columbia; winters south of the United States. Similar in size and appearance to the Ruby-throat, but with the chin and upper throat black, the rest of the throat gorget being violet or amethyst. It is an abundant species in summer in many localities, especially in the southern half of its range. They build their nests at low elevations, rarely above ten feet, on small branches or the fork at the end of a limb. The nests are made of yellowish plant fibres and are not covered with lichens, so that they have a peculiar spongy appearance. Eggs indistinguishable from those of the Ruby-throat. Laid during April, May or June.




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RUBY-THROATED HUMMINGBIRD.
Page 275 430--431. 430. Costa's Hummingbird. Calypte costæ. Range.--Southwestern United States; north to southern Utah; winters south of our border. Smaller than the last and with both the crown and the throat gorget, violet or amethyst, the feathers on the sides of the latter being lengthened. Their nests are situated in the forks of branches generally near the ground, and seldom above six feet from it. They are made of plant down with shreds of weeds, bark and lichens worked into the outside portions, and are often lined with soft feathers. The two eggs average .48 × .32. Data.--Arroyo Seco, California, June 10, 1900. Nest in an alder bush. Collector, Charles E. Groesbeck. 431. Anna's Hummingbird. Calypte anna. Range.--Pacific coast of the United States from northern California, southward, wintering in Mexico and southern California. This handsome species has both the crown and the broadened and lengthened throat gorgets, a purplish pink; it is slightly larger than the Ruby-throat. They are very abundant in their restricted range, and nest in February and March and again in April or May, raising two broods a season. Their nests are made of plant down and covered on the outside with cobwebs and a few lichens, and are generally located at a low elevation. The white eggs average .50 × .30. Data.--Santa Monica, California, March 4, 1897. Nest in a bunch of seed pods in a gum tree, ten feet from the ground. Collector, Tom Bundy.