The late Elijah P. Barrow, of Andover, Mass., a young naturalist of much promise, found several nests of this rare Warbler, all of which were concealed by grass. The eggs he found varied in length from .59 to .61 of an inch, and in breadth from .50 to .51 of an inch. Both parents, as observed by him, were entirely silent. The Nashville Warbler has been said to be a comparatively silent and songless bird, rarely giving forth any sounds, and these are compared by Dr. Richardson to the creaking noise made by the whetting of a saw. Wilson compares these sounds to the cracking of dry twigs or the striking together of small pebbles. Mr. J. A. Allen speaks of its song as being similar to that of the Chestnut-sided Warbler, which latter bird, as is well known, has notes so closely resembling those of the Summer Yellow-Bird that it is difficult to distinguish one from the other by their notes. Mr. T. M. Trippe states, also, that this Warbler has a very fine song, resembling that of the Summer Yellow-Bird more nearly than any other. These Warblers arrive in Massachusetts about the first of May, and remain about three weeks, when the larger portion move farther north. More recently Mr. Paine writes me that the Nashville Warbler has of late years become a common bird in certain localities in Central Vermont. They come and keep company with the Canada Warbler, but are more restless than that species at the time of their first appearance. They always in the breeding-season take up their abode in thickets, where there are also tall trees. Mr. Paine adds that their song consists of repetitions of single notes, the last terminating somewhat abruptly. Their song ceases by the 10th of June. After their young are ready to fly, they disperse about the woods and fields, and are then not readily discovered. Helminthophaga virginiæ, BAIRD. ROCKY MOUNTAIN WARBLER; VIRGINIA’S WARBLER. _Helminthophaga virginiæ_, BAIRD, Birds N. Am. under explanation of plates, 1860, xi, pl. lxxix, fig. I (Fort Burgwyn, N. M.); Rev. 177.—COOPER, Orn. Cal. 1, 1870, 85. SP. CHAR. Somewhat like _H. ruficapilla_. _Male._ Top and sides of head, back, and wings light ashy-plumbeous; quills and tail-feathers brown, edged with pure ashy-plumbeous, the latter indistinctly and narrowly margined with whitish internally and at the end. Rump, with upper and lower tail-coverts, bright yellow, in vivid contrast with the rest of the body. Crown with a concealed patch of rich chestnut. Rest of under parts brownish-white, with a patch of rich yellow on the jugulum. Inside of wings and axillars pure white. A white ring round the eye. Bill and legs dusky. The colors much duller in autumn. _Female, spring._ Similar to the male, but chestnut spot on crown obsolete, the yellow jugular patch less distinct, the upper tail-coverts more greenish, and the lower less rich yellow. Length, 5.00; extent, 7.25; wing, 2.50 when fresh. Dried skin: length, 4.90; wing, 2.50; tail, 2.20; tarsus, .67.