HABITS. Of this rare Thrush little is known. So far as observed, its habits appear to be nearly identical with those of the Californian species (_H. redivivus_). It is found associated in the same localities with _H. lecontei_, which also it appears to very closely resemble in all respects, so far as observed. The first specimen was obtained by Dr. T. C. Henry, near Mimbres, and described by him in May, 1858, in the Proceedings of the Philadelphia Academy of Sciences. A second specimen was obtained by H. B. Möllhausen, at Fort Yuma, in 1863. Dr. Coues did not observe it at Fort Whipple, but thinks its range identical with that of _H. lecontei_. Dr. Cooper found this species quite common at Fort Mojave, but so very shy that he only succeeded in shooting one, after much watching for it. Their song, general habits, and nest he speaks of as being in every way similar to those of _H. redivivus_. The eggs remained unknown until Dr. E. Palmer had the good fortune to find them at St. George, Southern Utah, June 8, 1870. The nest was an oblong flat structure, containing only a very slight depression. It was very rudely constructed externally of coarse sticks quite loosely put together; the inner nest is made of finer materials of the same. The base of this nest was 12 inches long, and 7 in breadth; the inner nest is circular, with a diameter of 4½ inches. The eggs are of an oblong-oval shape, one end being a little less obtuse than the other. In length they vary from 1.15 to 1.12 inches, and in breadth from .84 to .82 of an inch. They are of a uniform blue color, similar to the eggs of the common Robin (_Turdus migratorius_), only a little paler or of a lighter tint. In the total absence of markings they differ remarkably from those of all other species of the genus. GENUS MIMUS, BOIE. _Mimus_, BOIE, Isis, Oct. 1826, 972. (Type _Turdus polyglottus_, LINN.) _Orpheus_, SWAINSON, Zoöl. Jour. III, 1827, 167. (Same type.) [Line drawing: _Mimus polyglottus._ 8159] GEN. CHAR. Bill not much more than half the length of the head; gently decurved from the base, notched at tip; commissure curved. Gonys straight, or slightly concave. Rictal bristles quite well developed. Wings rather shorter than the tail. First primary about equal to, or rather more than, half the second; third, fourth, and fifth quills nearly equal, sixth scarcely shorter. Tail considerably graduated; the feathers stiff, rather narrow, especially the outer webs, lateral feathers about three quarters of an inch the shorter in the type. Tarsi longer than middle toe and claw by rather less than an additional claw; tarsi conspicuously and strongly scutellate; broad plates seven. Of this genus there are many species in America, although but one occurs within the limits of the United States. The single North American species _M. polyglottus_ is ashy brown above, white beneath; wings and tail black, the former much varied with white. Mimus polyglottus, BOIE.