Turdus. Tarsi long, exceeding the middle toe; wings reaching to the middle of the tail, which is about four fifths the length of the wings. Bill stout; its upper outline convex toward the base. Second quill shorter than fifth.
Saxicola. Tarsi considerably longer than the middle toe, which reaches nearly to the tip of the tail. Tail short, even; two thirds as long as the lengthened wings, which reach beyond the middle of the tail. Second quill longer than fifth. Bill attenuated; its upper outline concave towards the base.
Sialia. Tarsi short; about equal to the middle toe. Wings reaching beyond the middle of the tail. Bill thickened.
Genus SAXICOLA, Bechstein.
Saxicola, Bechstein, Gemeinnützige Naturg. 1802. (Type, S. œnanthe.)
Saxicola œnanthe, Bechst.
18075
Gen. Char. Commissure slightly curved to the well-notched tip. Culmen concave for the basal half, then gently decurving. Gonys straight. Bill slender, attenuated; more than half the length of head. Tail short, broad, even. Legs considerably longer than the head; when outstretched reaching nearly to the tip of tail. Third quill longest; second but little shorter. Claws long, slightly curved; hind toe rather elongated.
As already stated, America possesses but a single member of this group of birds, so well represented in the Old World. The color is bluish-gray, with wings, a stripe through the eye, and the middle of exposed tail-feathers black.