I have frequently seen eight or ten of these bold and spirited birds, with numerous other small Honey-eaters and Parrakeets, on a single tree, displaying the most elegant and easy movements, clinging and hanging in every variety of position, frequently at the extreme ends of the small, thickly-flowered branches, bending them down with their weight; they may, however, be easily distinguished from the other birds with which they are in company by their superior size, the brilliancy of their blue face, and the contrasted colours of their plumage; they are rendered equally conspicuous by the pugnacity with which they chase and drive about the other species resorting to the same tree. It frequently utters a rather loud and monotonous cry, not worthy the name of a song. I observed a most curious fact respecting the nidification of this bird: in every instance that I found its eggs, they were deposited on the deserted, dome-shaped, large nest of the _Pomatorhinus_, so numerous in the Apple-tree Flats in the district of the Upper Hunter; never within the dome, but in a neat round depression on the top. I had many opportunities of driving the female off the nest, and I can therefore speak with confidence as to this fact. Whether this bird resorts only to places where it may avail itself of the nest of the _Pomatorhinus_, or whether, under other circumstances, it constructs a nest for itself, are points to which I would call the attention of those who are favourably situated for investigating them; and who, by so doing, would render the history of this species so much the more complete. It is probable that, in places where no suitable substitute is to be found, it makes a rather small nest, like all the other species of its tribe. It commences breeding early, and rears at least two broods in the year: on reference to my note-book, I find I saw fully-fledged young on the 19th of November, and that I took many of their eggs in December: they were generally two in number, of a rich salmon colour irregularly spotted with rust-brown, one inch and a quarter long by ten and a half lines broad. The sexes differ in no respect from each other either in the colouring of the plumage or in the blended richness and delicacy of the blue surrounding the eye, to which it is almost impossible for the artist to do justice. The young assume the plumage of the adult from the nest, but differ from them in having the naked face and the base of the bill of a pale yellowish olive, which gradually changes to blue after the first season; this has doubtless occasioned the great number of synonyms quoted above.