Of the two North American species one is the well-known Robin, the other a closely related form from Cape St. Lucas; which indeed is probably only a local race or variety, although nothing exactly like it has yet been found away from Lower California. The following diagnosis may serve to distinguish the two birds:— COMMON CHARACTERS. Throat white with dark streaks. Rest of under parts, including lining of wing, reddish or ochraceous; the anal region whitish; lower eyelid white. Nest on trees. Eggs plain blue. Above slaty-olive, approaching to black on the head. Beneath rufous-chestnut. Spot in lore and on upper eyelid of white. Tail, 4.25. _Hab._ Whole of North America; Mexico, south to Oaxaca and Cordova; Cuba (very rare) and Tobago, of West Indies … var. _migratorius_. Above dull grayish-ash, not darker on the head. Beneath pale yellowish-buff; tinged with ashy across breast; a continuous white stripe from the lores over and a quarter of an inch behind the eye. More white on belly and flanks than in _T. migratorius_. Bill stouter; tail only 3.75, while the wing is the same. _Hab._ Cape St. Lucas, Lower California … var. _confinis_. Turdus migratorius, var. migratorius, LINN. ROBIN; AMERICAN REDBREAST. _Turdus migratorius_, LINN. S. N. 12th ed. 1766, 292.—SCLATER, P. Z. S. 1856, 294; 1859, 331; 1864, 172.—IB. Catal. Am. Birds, 1861, 4.—SCLATER & SALVIN, Ibis, 1860, 396 (Coban).—BAIRD, Birds N. Am. 1858, 218; Rev. Am. B. 1864, 28.—COOPER & SUCKLEY, P. R. R. R. XII, II, 1859, 172.—DRESSER, Ibis, 1865, 475. (Texas, winter).—COUES, Pr. A. N. S. 1866, 64 (Arizona).—DALL & BANNISTER (Alaska).—COOPER, Birds Cal.—SAMUELS, 154. Figures: VIEILLOT, Ois. Am. Sept. II, pl. lx, lxi.—WILSON, Am. Orn. I, 1808, pl. ii.—DOUGHTY, Cab. N. H. I, 1830, pl. xii.—AUDUBON, Birds Am. III, pl. cxlii; Orn. Biog. II, pl. cxxxi. SP. CHAR. Tail slightly rounded. Above olive-gray; top and sides of the head black. Chin and throat white, streaked with black. Eyelids, and a spot above the eye anteriorly, white. Under parts and inside of the wings, chestnut-brown. The under tail-coverts and anal region, with tibiæ, white, showing the plumbeous inner portions of the feathers. Wings dark brown, the feathers all edged more or less with pale ash. Tail still darker, the extreme feathers tipped with white. Bill yellow, dusky along the ridge and at the tip. Length, 9.75; wing, 5.43; tail, 4.75; tarsus, 1.25. HAB. The whole of North America; Mexico, Oaxaca, and Cordova; Guatemala; Cuba, very rare, GUNDLACH; Tobago, KIRK; Bermuda, JONES; Orizaba (Alpine regions, breeding abundantly), SUMICHRAST. Young birds have transverse blackish bars on the back, and blackish spots beneath. The shafts of the lesser coverts are streaked with brownish-yellow; the back feathers with white. [Illustration: _Turdus migratorius._]