Bill brownish-black. Iris dark brown. Feet greyish-blue, as are the claws. The whole upper part of the head and the hind neck pure black, as is a large patch on the throat and fore-neck. Between these patches of black is a band of white, from the base of the bill down the sides of the neck, becoming broader behind, and encroaching on the back, which, with the wing-coverts, is ash-grey tinged with brown. Quills dark greyish-brown, margined with bluish-white, the secondary quills so broadly margined as to leave a conspicuous white dash on the wing; tail of the same colour, the feathers similarly edged. Lower parts brownish-white, the sides pale yellowish-brown. Length to end of tail 5-1/8 inches, to end of wings 3-7/8, to end of claws 4-1/2; extent of wings 8-1/4; wing from flexure 2-10/12; tail 2-9/12; these measurements taken from three males. In another, the bill along the ridge (4-1/2)/12; along the edge of lower mandible 7/12; tarsus 7/12; hind toe 3/12, its claw 4/12; middle toe 5/12, its claw 3/12. Adult Female. Plate CCCLIII. Fig. 4. The Female is similar to the male. Male examined. The tongue is 4-1/2 twelfths long, emarginate and papillate at the base, flat above, depressed, tapering, the point horny, slit, with four bristly points. Œsophagus, _b_, _c_, _d_, 1-1/2 inch long, tapering at the commencement to the diameter of 2 twelfths, and then continuing nearly uniform, without dilatation; the proventriculus, _c_, _d_, is not much enlarged. The stomach, _d_, _e_, is a strong gizzard, of an oblong form or ovate, 4 twelfths long, 3 twelfths broad, with strong lateral muscles; its epithelium longitudinally rugous, and of a dark reddish-brown colour. Intestine 7-1/4 inches long, the diameter of its duodenal portion, _f_, _g_, _h_, 2-1/2 twelfths. The rectum, _g_, _k_, is 7-1/2 twelfths long; the cœca, _j_, 1 twelfth long, and 1/4 twelfth in diameter. [Illustration] The trachea is 1-2/12 inch long, its diameter uniform, 3/4 twelfths, its rings 42. It is furnished with lateral or contractor muscles, sterno-tracheal, and four pairs of inferior laryngeal. Bronchi short, of about 10 rings. CHESTNUT-CROWNED TITMOUSE. _PARUS MINIMUS_, TOWNSEND. PLATE CCCLIII. MALE AND FEMALE.