_Troglodytes leucogastra_, GOULD, P. Z. S. 1836, 89 (Tamaulipas).— BON. Notes Delattre, 1854, 43. ? _Thryothorus bewickii_, SCLATER, P. Z. S. 1859, 372 (Oaxaca). _Thryothorus bewickii_, var. _leucogaster_, BAIRD, Rev. Am. B. 127. SP. CHAR. Above ashy-brown; rump and middle tail-feathers brownish-ash, the former nearly pure ash; without appreciable bars; bars on secondaries obsolete. Beneath, including inside of wing, pure white, with little or no brownish on the sides. Crissum banded; ground-color of the quills and tail-feathers grayish-brown. Size of var. _bewickii_. HAB. Southern borders of United States, into Mexico. HABITS. Nothing is on record of the habits of this variety as distinguished from var. _bewickii_. Thryothorus bewickii, var. spilurus, VIGORS. _Troglodytes spilurus_, VIGORS, Zoöl. Beechey’s Voyage, 1839, 18, pl. iv, fig. 1 (California). _Thryothorus spilurus_, COOPER, Orn. Cal. 1, 1870, 69. _Troglodytes bewickii_, NEWBERRY, P. R. R. Rept. VI, IV, 1857, 80.—COOPER & SUCKLEY, IB. XII, II, 1860, 190. _Thryothorus bewickii_, SCLATER, Catal. 1861, 22, no. 141 (in part). _Thryothorus bewickii_, var. _spilurus_, BAIRD, Rev. 126. SP. CHAR. Similar to _bewickii_ in color, the bill considerably longer. Length from nostril, .50, gape, .81, instead of .39 and .70. HAB. Pacific slope of United States. Young birds from all the localities differ from adults merely in having the feathers of the throat and breast very narrowly and inconspicuously edged with blackish. HABITS. This variety of Bewick’s Wren is exclusively an inhabitant of the Western coast. According to Dr. Cooper, they abound throughout the wooded parts of California and northward, frequenting the densest forests as well as the open groves. During the winter they were found in the vicinity of Fort Mojave, but left in April, probably for the mountains. They also winter throughout the mild regions towards the coast as far north as Puget Sound. They are known as Mocking-Wrens, though Dr. Cooper thinks they do not really imitate other birds, but rather have a great variety of their own notes, some of which resemble those of other birds and are well calculated to deceive one unaccustomed to them. He was often led to search in vain for some new form, which he thought he heard singing, only to find it to be a bird of this species. Near San Diego, in April, 1862, he discovered one of its nests built in a low bush, only three feet from the ground. It was quite open above, formed of twigs, grass, etc., and contained five eggs just ready to hatch, described as white with brown specks near the larger end.