The BLACK-HEADED BUTCHER-BIRD TANGARA (_Lanio atricapillus_) is about five and a quarter inches long, and eight and a quarter across the wings; the tail measures two and a half inches, and the wings three inches. The plumage of the male is black upon the upper part of the body; the forehead, eyes, throat, and a line over the tail greenish brown, the under parts of a bright yellow, and the centre of the back and breast of a reddish shade; a white line passes over the wings. The coat of the female is greenish red, the head dark green, and the middle of the belly bright yellow. These birds are numerous in Guiana, where they generally live in pairs upon the trees in plantations, or near the coast. D'Orbigny found them in small flocks, occupying the hot woods at the foot of the Bolivian Alps, and perching so high upon the branches as to render their capture difficult. Their food consists of seeds and the tender shoots of young plants. * * * * * The ORGANIST TANGARAS (_Euphone_) constitute another group. These birds bear a strong family resemblance to the True Tangaras, from which they have been separated on account of their possessing _two_ tooth-like prominences behind the apex of the upper mandible. In their general habits, compact body, short tail, high tarsus, and short broad back, they seem closely allied to the MANAKINS (_Pipra_). They are small, thick-headed birds, with strong beaks, which are distinguished by the peculiarity mentioned above, and much compressed towards the tip. The wings are short, covered with narrow feathers, and do not reach beyond the root of the tail; their first three quills are of equal length, the tail is very short and narrow, and the individual tail-feathers rounded at their extremities. The plumage differs in the two sexes, the back of the male being of a blueish steel colour, inclining to green, and that of the female olive green; the lower parts of the body are brilliant yellow or light green. A most striking peculiarity in this species is the seeming absence of any proper stomach or gizzard, these being replaced by a simple spindle-shaped dilatation, resembling a crop, situated at the termination of the gullet. The Organist Tangaras lead a solitary life, inhabiting the depths of forests, and living upon berries of various kinds; their nests are built upon thickly-foliaged trees or bushes; the eggs are very long, of a pale red colour, spotted with reddish brown at the broad end. Their voice is extremely pleasant and melodious, and capable of a great variety of notes. Our space does not permit us to mention more than one example of this group, and our readers must, therefore, take it for granted that all its other members are more or less similar in appearance and habits to the species we describe. THE VIOLET ORGANIST.