There is a remarkable analogy in the Water Thrushes to the Snipes and Plovers, in their habits of running by the side of water, of wading, and of flirting up the hinder parts; in the height of the tarsi; and in the elongation of the tertials. The Pea-Dove, which frequents water more than any other of our Doves, has longer tertials than any. Is there any connexion between the lengthening of these feathers, and aquatic habits? GOLD-CROWNED THRUSH.[34] _Land Kick-up._ _Seiurus aurocapillus._ _Turdus aurocapillus_, +Linn.+—Aud. pl. 143. _Sylvia aurocapilla_, +Bonap.+ _Seiurus aurocapillus_, +Sw.+ [34] Length 6¹⁄₄ inches, expanse 9¹⁄₂, flexure 3, tail 2¹⁄₁₀, rictus ⁷⁄₁₀, tarsus 1, middle toe ³⁄₄. The speckled breast, rich fulvous crown, and warm olive back, make this a very pretty bird. His manners are much like those of his cousin Bessy, running along with much wagging of the tail, and chirping _tsip, tsip_, incessantly. He is, however, less aquatic in his predilections. I first observed the species about the middle of September; it was on a low part of the road by the side of a morass. Its attitude struck me, as it was running on the ground with the tail held almost perpendicularly upwards. In the stomach, a muscular gizzard, I have occasionally found _various seeds_, gravel, mud-insects, caterpillars, and small turbinate shells. I was one day amused by watching two, unassociated, walking about a place covered with dry leaves, beneath some trees. I was unseen by them, though quite close. The tail of each was carried quite perpendicular as they walked, which gave a most grotesque effect; but, as if this elevation were not sufficient, at almost every step they jerked it up still higher, the white under-coverts projecting in a puffy globose form. Though this species arrives in Jamaica rather later than the preceding, they depart together, about the 20th of April: and soon after this their appearance in the United States is recorded. Unlike the preceding, the present species is said to be, even in summer, destitute of song. BLUE YELLOW-BACK WARBLER.[35] _Parula Americana._ _Parus Americanus_, +Linn.+ _Sylvia Americana_, +Lath.+—Aud. pl. 15. _Sylvia pusilla_, +Wils.+ _Parula Americana_, +Bonap.+ [35] Length 4¹⁄₂ inches, expanse 7, flexure 2¹⁄₄, tail 1⁶⁄₁₀, rictus ⁵⁄₁₀, tarsus ³⁄₄, middle toe ⁴⁄₁₀.