So far as is yet known, this elegant Kestril is not only confined to Australia, but its habitat is even restricted to the south-eastern portion of that continent. I observed it to be tolerably abundant in every part of New South Wales, and also on the plains of the interior in the neighbourhood of the river Namoi. A large collection of birds from South Australia, kindly forwarded to me by T. C. Eyton, Esq., also contained examples. Mr. Caley states that it is a migratory species, but I am inclined to differ from this opinion; his specimens were procured in New South Wales in May and June, while mine were obtained at the opposite season of December, when it was breeding in many of the large gum-trees on the rivers Mokai and Namoi; probably some districts are deserted for a short time, and such others resorted to as may furnish it with a more abundant supply of its natural food, and this circumstance may have led him to consider it to be migratory. The flight of the Nankeen Kestril differs from that of its European ally in being more buoyant and easy, the bird frequently suspending itself in the air without the slightest motion of the wings: it also flies much higher, and having arrived at a great height flies round in a series of circles, these flights being often performed during the hottest part of the day; a circumstance which leads me to suppose that some kind of insect food was the object of the search, it being well known that in mid-day insects ascend to a much greater altitude than at any other time. The sexes present the usual differences in their markings, the female having all the upper surface alternately barred with buff and brown, while the male is furnished with a more uniform tint. I once took four fully-fledged young from the hole of a tree by the side of a lagoon at Brezi, in the interior of New South Wales; I also observed nests which I believe were constructed by this bird, but which were placed on the branches in the ordinary way of the members of this group.