The REDSTARTS (_Ruticilla_) are distinguishable by their slender body, awl-shaped beak, which is furnished with a slight hook at the tip of the upper mandible; slender, delicate feet; high tarsi; moderately long wings and tail, the latter almost straight at its extremity, and lax plumage, which varies considerably according to the age and sex of the bird. The members of this group inhabit the eastern hemisphere (Asia especially being tolerably rich in species), and resemble each other no less in their habits and general disposition than in their general coloration and appearance. THE BLACK-CAPPED REDSTART. The BLACK-CAPPED REDSTART (_Ruticilla atra_ or _Ruticilla titys_) is black upon the head, the back and lower part of the breast being grey. The belly is whitish, the wings spotted with white; the feathers on the wings, and those that form the tail, with the exception of two in the centre, are yellowish red. Uniform deep grey predominates in the coloration of the female and one year old male, the plumage of the latter being marked with undulating black lines. The length of this species is six, and its breadth ten inches. The wing measures three inches and one-third, and the tail two inches and a half. The Black-capped Redstart inhabits Europe, and is numerous in such parts of the continent as are rocky or mountainous. In Switzerland it is not uncommon to see these birds not only perching at a very considerable altitude, but disporting themselves over the glaciers and beds of snow. In marshy districts or low-lying valleys they are met with far less frequently, and are much more numerous in the south of Europe than in the northern portions. Though by no means social, this species exhibits but little fear of man, and will take up its abode on the house-tops of a crowded city, apparently quite undisturbed by the noise and bustle of the streets. In disposition it is lively and restless, and from dawn to long after sunset appears to be in a state of constant excitement and activity. Like the Fly-catcher, it seizes its insect prey whilst upon the wing, and performs a great variety of beautiful evolutions, as it alternately soars and sinks through the air. Upon the ground it moves with swiftness and ease, bowing its head repeatedly, and whisking its tail whenever anything happens to attract its particular attention, or when under the influence of emotion. The voice of the Black-capped Redstart, though by no means beautiful, possesses great flexibility, and is capable of imitating the songs of a great variety of other birds.