Whip-poor-will, Caprimulgus vociferus, Nutt. Man. v. i. p. 614. GENUS II. CHORDEILES, Swainson. NIGHT-HAWK. Mouth opening to beneath the centre of the eyes; bill extremely small; upper mandible with the tip decurved, and a deep lateral groove. Nostrils oblong, prominent, marginate. Eyes very large. Aperture of ear elliptical, very large. Head very large, depressed, but less so than in Caprimulgus. Claw of middle toe pectinate. No bristles at the base of the upper mandible. Wings very long, pointed, with the first quill longest, and the secondaries very short. Tail emarginate. 43. 1. Chordeiles Virginianus, Briss. Virginian Night-Hawk.--Bat. Crapaud volant. Plate CXLVII. Male and Female. Upper parts brownish-black, mottled with white and pale reddish-brown; a conspicuous white bar extending across the inner web of the first, and the whole breadth of the next four quills; tail-feathers barred with brownish-grey, the four outer on each side plain brownish-black towards the end, with a large white spot; sides of the head and fore neck mottled like the back; a broad white band, in the form of the letter V reversed on the throat and sides of the neck; the rest of the lower parts greyish-white, transversely undulated with dark brown. Female similar, with the dark parts more brown, the white more tinged with red, the band on the throat brownish-white, and the white spots on the tail-feathers wanting. _Male_, 9-1/2, 23-1/2. _Female_, 9-3/4, 23-3/4. From Texas northward. Columbia River. Throughout the interior. Migratory. Very abundant. Night-Hawk, Caprimulgus Americanus, Wils. Amer. Ornith. Biog. v. v. p. 65. Caprimulgus Virginianus, Bonap. Syn. p. 62. Caprimulgus (Chordeiles) Virginianus, Swains. & Rich. F. Bor. Amer. v. i. p. 62. Night-Hawk, Caprimulgus Americanus, Nutt. Man. v. i. p. 619. Night-Hawk, Caprimulgus Virginianus, Aud. Orn. Biog. v. ii. p. 273; v. v. p. 406. FAMILY V. CYPSELINÆ. SWIFTS. Mouth opening to beneath the hind part of the eyes; bill extremely short, very broad at the base, compressed at the end; upper mandible decurved at the point, the edge inflected, with an indistinct sinus. Nostrils basal, approximate, oblong. Head large and depressed; neck short; body rather slender. Feet extremely short; tarsus rounded, destitute of scutella; toes extremely short, the three anterior nearly equal; hind toe very small, and versatile; claws strong, compressed, arched, very acute. Plumage compact; no bristles at the base of the upper mandible; wings extremely elongated, falciform, the first quill longest; tail of ten feathers. Œsophagus of moderate width, without crop; stomach oblong, moderately muscular, with a dense rugous epithelium; intestine short, and rather wide; no cœca. No inferior laryngeal muscles. Nest in crevices or holes, or attached to high places. Eggs elongated, white. GENUS I. CHÆTURA, Stephens. SPINE-TAIL.