Dr. Bryant, in his Notes on the Birds of Yarmouth, N. S., etc., mentions finding quite a number of this species on Big Mud Island, near that place. A pair of these birds with their young were seen by him near Yarmouth on the 3d of July. Their habits seemed to him identical with those of the Black-Cap. The young were fully grown and could fly with ease, yet their parents were so solicitous about their safety that he could almost catch them with his hand. Their notes appeared to him similar to those of our common species, but sharper and more filing, and can be readily imitated by repeating, with one’s front teeth shut together, the syllables _tzēē-dēē-dēē-dēē_. Mr. Audubon found a nest of this Titmouse in Labrador. It was built in a decayed stump about three feet from the ground, was purse-shaped, eight inches in depth, two in diameter, and its sides an inch thick. It was entirely composed of the finest fur of various quadrupeds, chiefly of the northern hare, and all so thickly and ingeniously matted throughout as to seem as if felted by the hand of man. It was wider at the bottom than at the top. The birds vehemently assailed the party. Mr. Ross, in notes communicated to the late Mr. Kennicott, mentions that specimens of this species were shot at Fort Simpson, October 13, in company with _P. septentrionalis_, and others were afterwards seen towards the mountains. The notes he describes as harsher than those of the _septentrionalis_. The Smithsonian museum contains specimens from Fort Yukon and Great Slave Lake, besides the localities already referred to. Mr. Dall found it the commonest Titmouse at Nulato, abundant in the winter, but not present in the spring. The eggs of this species measure .56 by .47 of an inch, are of a rounded oval shape, and with a white ground are somewhat sparingly marked with a few reddish-brown spots. These are usually grouped in a ring around the larger end. GENUS PSALTRIPARUS, BONAP. _Psaltriparus_, BONAP. Comptes Rendus, XXXI, 1850, 478. (Type, _P. melanotis_.) _Ægithaliscus_, CABANIS, Museum Heineanum, 1851, 90. (Type, _Parus erythrocephalus_.) _Psaltria_, CASSIN, Ill. N. Am. Birds, 1853, 19. GEN. CHAR. Size very small and slender. Bill very small, short, compressed, and with its upper outline much curved for the terminal half. Upper mandible much deeper than under. Tail long, slender, much graduated; much longer than the wings; the feathers very narrow. Tarsi considerably longer than the middle toe. No black on the crown or throat. Eyes white in some specimens, brown in others. Nest purse-shaped; eggs unspotted, white. No bird of this genus belongs to the eastern portion of the United States. The three species may be defined as follows:— A. Head striped with black on the sides. P. melanotis. The stripes passing under the eye and uniting on the occiput. _Hab._ Eastern Mexico B. No stripes on the head.