with brushwood; they are also constantly seen around the Indian villages, and are called Chiangos by the natives. Unlike most of their congeners, they are very social and active, carrying on the pursuit of the insects upon which they subsist in broad daylight. The Prince von Wied assures us that he only once saw any great number of them together, and that was upon a large tract of land in the province of Bahia; they were flying fearlessly around the horses and cattle, apparently enjoying the intense heat of the sun, to which they were exposed. Schomburghk describes their flight as equalling that of the Falcon in swiftness, and the movements of their wings as resembling those of the Swallow. If disturbed, they endeavour to conceal themselves from observation among the low grass, and exhibit so much dexterity in evading pursuit, as to have given rise, among the Indians, to the strange fancy that the Nacundas possess two pairs of eyes. As night approaches, their melancholy cry is constantly to be heard, as they sweep in large parties around the trees, or over the fields, during their noisy and incessant pursuit of food. Burmeister found a Nacunda's egg in some long grass under a bush; it was almost cylindrical in form, the shell yellowish white, thickly marked with three shades of brown. Azara states that this species lays two eggs. * * * * * The TWILIGHT NIGHT JARS (_Chordeiles_) are recognisable by their slender body, short neck, and large head. Their wings, in which the second quill exceeds the rest in length, are long and pointed. The tail is short, formed of broad, powerful feathers, and more or less forked at its extremity; the legs are smooth, and the toes short; the centre toe being armed with a very decidedly hooked and serrated claw. Their plumage is thick, composed of small feathers, and is brighter in hue and more distinctly marked than that of most of their congeners. THE NIGHT FALCON. The NIGHT FALCON (_Chordeiles Virginianus_), a well-known member of this group, is an inhabitant of North and South America. Its length is about eight and a half, and its breadth from twenty to twenty-one inches; the wing measures seven inches and two-thirds. The upper part of the plumage is brownish black, spotted with white and pale brownish red. The secondary quills are dotted with brownish white, and the first five primaries have a broad stripe of white across their centre. The tail is striped with brown and grey, its four exterior feathers being tipped with white; the under side of the body is greyish white, marked with undulating brown lines; the throat is surrounded by a broad white line. The female resembles her mate, but the brown parts are darker, and the whitish spots redder, than in the plumage of the male. Her tail has no white spots at its extremity.