Black-and-white Creeper, Certhia varia, Wils. Amer. Orn. v. iii. p. 23. Sylvia varia, Bonap. Syn. p. 81. Black-and-white Creeper, Certhia varia, Aud. Orn. Biog. v. i. p. 452; v. v. p. 471. FAMILY IX. CERTHIANÆ. CREEPERS. Bill of moderate length or rather long, slender, slightly arched, much compressed, acute; upper mandible with its dorsal outline convex or arched, the ridge narrow, the notches slight or obsolete, lower mandible with the angle rather long and narrow, the dorsal line straight or slightly decurved, the edges inclinate, the tip acute. Head moderate, ovate; neck short, body slender. Feet of moderate length, or rather short; tarsus about the same length as the middle toe, compressed, with eight anterior scutella, toes of moderate length, much compressed, hind toe proportionally long, outer adherent at the base; claws rather long, extremely compressed, arched, acute. Wings short or of moderate length. Tail of twelve feathers, generally much rounded. Tongue slender, emarginate and papillate at the base, very narrow, tapering to a lacerated point. Œsophagus of moderate width, without crop; proventriculus bulbiform; stomach of moderate size, oblong, or elliptical, moderately muscular, with the muscles distinct; epithelium dense, longitudinally rugous; intestine short, rather wide; cœca very small; cloaca globular. Trachea simple, with four pairs of inferior laryngeal muscles. GENUS I. CERTHIA, Linn. TREE-CREEPER. Bill about the same length as the head, very slender, arched, much compressed, acute; upper mandible with the dorsal line arched, the ridge narrow, the sides sloping at the base, nearly erect in the rest of their extent, the edges sharp, arched, without notch, the tip acute; lower mandible with the angle rather long, narrow, and pointed, the outline decurved, the sides erect and convex, the edges inclinate, the tip acute. Nostrils linear-oblong, operculate. Head ovate; neck short; body slender. Feet rather short, very slender, tarsus rather shorter than the middle toe, very slender, much compressed; toes extremely compressed; the first comparatively large, longer than the middle toe, including the claw; the inner toe shorter than the outer; claws long, moderately arched, slender, extremely compressed, laterally grooved, acute, that of the hind toe very long. Plumage long, loose, very soft. Bristles obsolete. Wings of moderate length, very broad; the first quill very short, the fourth and fifth longest. Tail long, graduated, of twelve moderately stiff pointed feathers. 115. 1. Certhia familiaris, Linn. Brown Tree-Creeper. Plate CCCCXV. Male and Female.