HABITS. The common House Wren is found throughout the United States, from the Atlantic to the Rocky Mountains, though it is not everywhere equally abundant. Thus, while in some parts of Massachusetts it occurs in considerable numbers every year, in other portions not twenty miles distant it is never seen. West of the Rocky Mountains it is replaced by Parkman’s Wren, which is rather a race than a distinct species, the differences in plumage being very slight, and in habits, nest, and eggs not appreciable, though Dr. Cooper thinks there is a difference in their song. Another race or a closely allied species, _T. aztecus_, is found in Mexico, near the borders of the United States, but does not have an extended range. It is found in the winter in Guatemala. [Illustration: _Troglodytes ædon._] This species does not appear to be found beyond the southwestern portion of Maine and the southern portions of New Hampshire and Vermont. It makes its first appearance in Washington early in April, and for a while is very abundant, visiting very familiarly the public grounds of the capitol, private gardens, out-buildings, and the eaves of dwellings. It does not appear in the New England States until after the first week in May, and leaves for the South about the last of September. It is not observed in any portion of the United States after the first of November. The hollows of decaying trees, crevices in rocks, or the centre of meshes of interlacing vines, are their natural resorts. These they readily relinquish for the facilities offered in the society of man. They are bold, sociable, confiding birds, and will enter into the closest relations with those who cultivate their acquaintance, building their nests from preference under the eaves of houses, in corners of the wood-shed, a clothes-line box, olive-jars, martin-boxes, open gourds, an old hat, the skull of an ox placed on a pole, the pocket of a carriage, or even the sleeve of an old coat left hanging in an out-building. In the spring of 1855 a pair of these Wrens nested within the house, and over the door of the room of the late Robert Kennicott, where they raised their broods in safety. They built a second nest on a shelf in the same room, which they entered through a knot-hole in the unceiled wall. At first shy, they soon became quite tame, and did not regard the presence of members of the family. The male bird was more shy than his mate, and though equally industrious in collecting insects would rarely bring them nearer than the knot-hole, where the female would receive them. The female with her brood was destroyed by a cat, but this did not deter the male bird from appearing the following season with another mate and building their nest in the same place. Another instance of a singular selection of a breeding-place has been given by the same authority. Dr. Kennicott, the father of Robert, a country physician, drove an old two-wheeled open gig, in the back of which was a box, a foot in length