This Finch was found by Salvin about the reeds on the margin of Lake Dueñas, Guatemala, in February, but was not common. It is common, in the winter months, near Oaxaca, Mexico, where it was taken by Mr. Boucard. Mr. Kennicott saw its nest June 14. This was on the ground, built in a bunch of grass in rather an open and dry place, and containing five eggs. The female permitted him to approach very close to her, until he finally caught her on the nest with his beating-net. Another nest was placed in a bunch of grass growing in the water of a small grassy pond. The nest contained four eggs and one young bird. The nest and eggs of this species had been previously discovered by Dr. Hoy, near Racine. This is, I believe, the first instance in which it was identified by a naturalist, as also the most southern point at which it has ever been found. These eggs measure .74 by .60 of an inch. They have a pale greenish-white ground, and are thickly marked with dots and small blotches of a ferruginous-brown, often so numerous and confluent as to disguise and partially conceal the ground. Melospiza palustris, BAIRD. SWAMP SPARROW. _Fringilla palustris_, WILSON, Am. Orn. III, 1811, 49, pl. xxii, f. 1.—AUD. Orn. Biog. I, 1831, 331; V, 508, pl. lxiv. _Fringilla (Spiza) palustris_, BONAP. Obs. Wilson, 1825, No. 105. _Passerculus palustris_, BONAP. List, 1838.—IB. Conspectus, 1850, 481. _Ammodromus palustris_, AUD. Syn. 1839.—IB. Birds Am. III, 1841, 110, pl. clxxv. _Melospiza palustris_, BAIRD, Birds N. Am. 1858, 483.—SAMUELS, 323. _? Fringilla georgiana_, LATH. Index Orn. I, 1790, 460 (perhaps _Peucæa æstivalis_).—LICHT. Verz. 1823, No. 251. _Fringilla (Ammodromus) georgiana_, NUTT. Man. I, (2d ed.,) 1840, 588. SP. CHAR. Middle of the crown uniform chestnut; forehead black; superciliary streak, sides of head and back, and sides of neck, ash. A brown stripe behind the eye. Back with broad streaks of black, which are edged with rusty yellow. Beneath whitish, tinged with ashy anteriorly, especially across the breast, and washed with yellowish-brown on the sides. A few obsolete streaks across the breast, which become distinct on its sides. Wings and tail strongly tinged with rufous; the tertials black, the rufous edgings changing abruptly to white towards the end. Length, 5.75; wing, 2.40. _Female_ with the crown scarcely reddish streaked with black, and divided by a light line. Young conspicuously streaked beneath the head, above nearly uniform blackish. HAB. Eastern North America from the Atlantic to the Missouri; north to Fort Simpson. In autumn the male of this species has the feathers of the crown each with a black streak; and the centre of the crown with an indistinct light stripe, materially changing its appearance. The forehead is usually more or less streaked with black.