In one of Mr. Gilbert’s many interesting letters received since the account above referred to was printed, he says, “the questions as to the nidification of _Chlamydera_ is now settled by Mr. C. Coxon having found a nest in December with three young birds; in form it was very similar to that of the common Thrush of Europe, being of a cup-shape, constructed of dried sticks with a slight lining of feathers, and fine grass, and was placed among the smaller branches of an Acacia overhanging a pool of water.” 259. Chlamydera nuchalis Vol. IV. Pl. 9. “I found matter for conjecture,” says Captain Stokes, “in noticing a number of twigs with their ends stuck in the ground, which was strewed over with shells, and their tops brought together so as to form a small bower; this was 2½ feet long, 1½ feet wide at either end. it was not until my next visit to Port Essington that I thought this anything but some Australian mother’s toy to amuse her child; there I was asked, one day, to go and see the ‘birds’ playhouse,’ when I immediately recognised the same kind of construction I had seen at the Victoria River; the bird (_Chlamydera nuchalis_ of Mr. Gould’s work) was amusing itself by flying backwards and forwards, taking a shell alternately from each side, and carrying it through the archway in its mouth.”—_Discoveries in Australia_, vol. ii, p. 97. Genus PTILONORHYNCHUS, _Kuhl_. 260. Ptilonorhynchus holosericeus, _Kuhl_. Vol. IV. Pl. 10. That this bird continues its singular habits under the disadvantages of captivity, I learn from the following passage in a letter lately received from Mr. Strange of Sydney. “My aviary is now tenanted by a pair of Satin Birds, which I hoped would have bred, as for the last two months they have been constantly engaged in constructing bowers, which I find are built for the express purpose of courting the female in. Both sexes assist in their erection, but the male is the principal workman. At times the male will chase the female all over the aviary, then go to the bower, pick up a gay feather or a large leaf, utter a curious kind of noise, set all his feather erect, and run around the bower, into which at length the female proceeds, when he becomes so excited that his eyes appear ready to start from his head, and he continues opening first one wing and then the other, uttering a low whistling note, and like the common Cock, seems to be picking up something from the ground, until at last the female goes gently towards him, when, after two turns around her, he suddenly makes a dash and the scene ends.” This pair of birds was sent to England by Mr. Strange for the Earl of Derby, and had they not unfortunately died from cold while rounding Cape Horn, they would doubtless have continued their singular habits in his lordship’s magnificent aviary at Knowsley.