3d. The geographical distribution, the size and proportions, the pattern of coloration (except that of the head and body, which in all Owls is more or less different in the young and adult stages), and the shades of colors on the general upper plumage, are the same in both. The white “scalloping” on the outer web of the alula, the number of white spots on the primaries, and the precise number and position of the white bars on the tail, are features common to the two. 4th. The most extreme example of _albifrons_ has the facial circle uniform brown, like the neck, has no spots on the forehead, and the face is entirely uniform dark brown; but, 5th. Three out of the four specimens in the collection have the facial circle composed of white and brown streaks (adult feathers), precisely as in _acadica_, and the forehead similarly streaked (with adult feathers). Two of them have new feathers appearing upon the sides of the breast (beneath the brown patch), as well as upon the face; these new feathers are, in the most minute respects, like the common (adult) dress of _N. acadica_. The above facts point conclusively to the identity of the _Nyctale “albifrons”_ and _N. acadica_. This species is easily distinguishable from the _N. tengmalmi_, which belongs to both continents, though the North American and European specimens are readily separable, and therefore should be recognized as geographical races. Since the above was published in the American Naturalist for May, 1872, Dr. J. W. Velie, of Chicago, writing under date of November 20, 1872, furnishes the following proof of the identity of _N. “albifrons”_ and _N. acadica_: “In 1868, I kept a fine specimen of “_Nyctale albifrons_” until it moulted and became a fine specimen of _Nyctale acadica_. I had, until the fire, all the notes about this interesting little species, and photographs in the different stages of moulting.” HABITS. The Little Acadian or Saw-Whet Owl, as this bird is more generally denominated, appears to have a widespread distribution over temperate North America. It is not known to be anywhere very abundant, though its nocturnal and secluded habits tend to prevent any intimate acquaintance either with its habits or its numbers in any particular locality. It is rarely found in the daytime out of its hiding-places. It was not met with by Richardson in the fur regions, yet it is generally supposed to be a somewhat northern species, occurring only in winter south of Pennsylvania, but for this impression there does not seem to be any assignable reason or any confirmatory evidence. It has been said to breed near Cleveland, Ohio, and its nest and eggs to have been secured. The taking of Kirtland’s Owl, which is now known to be the immature bird of this species, near that city, as well as in Racine, and at Hamilton, Canada, is also suggestive that this Owl may breed in those localities.