Subfamily PASSERELLINÆ.
Char. Toes and claws very stout; the lateral claws reaching beyond the middle of the middle one; all very slightly curved.
Passerella iliaca.
846
Bill conical, the outlines straight; both mandibles equal; wings long, longer than the even tail or slightly rounded, reaching nearly to the middle of its exposed portion. Hind claw longer than its digit; the toe nearly as long as the middle toe; tarsus longer than the middle toe. Brown above, either uniformly so or faintly streaked; triangular spots below.
This section embraces a single North American genus, chiefly characterized by the remarkable elongation of the lateral claws, as well as by the peculiar shape and large size of all the claws; the lateral, especially, are so much lengthened as to extend nearly as far as the middle. The only approach to this, as far as I recollect, among United States Conirostres, is in Pipilo megalonyx, and Xanthocephalus icterocephalus.
Passerella, Swainson, Class. Birds, II, 1837, 288. (Type, Fringilla iliaca, Merrem.)
Gen. Char. Body stout. Bill conical, not notched, the outlines straight; the two jaws of equal depth; roof of upper mandible deeply excavated, and vaulted; not knobbed. Tarsus scarcely longer than the middle toe; outer toe little longer than the inner, its claw reaching to the middle of the central one. Hind toe about equal to the inner lateral; the claws all long, and moderately curved only; the posterior rather longer than the middle, and equal to its toe. Wings long, pointed, reaching to the middle of the tail; the tertials scarcely longer than secondaries; second and third quills longest; first equal to the fifth. Tail very nearly even, scarcely longer than the wing. Inner claw contained scarcely one and a half times in its toe proper.
Color. Rufous or slaty; obsoletely streaked or uniform above; thickly spotted with triangular blotches beneath.