This owl was shot on the Darling, after having been startled out of a tree.

13. STRIX DELICATULUS, GOULD.--Delicate Owl.

Nearly allied to the Strix flammea, or Barn Owl of England. This bird, widely spread over the continent of Australia, inhabits the interior in great numbers, wherever there are trees large enough for it to build in. Their young were just fledged when the Expedition descended into the western interior, and at sunset came out on the branches of the gum-trees, where they sat for several hours to be fed, making a most discordant noise every time the old birds came with a fresh supply of food, which was about every quarter of an hour. It was frequently impossible to sleep from the constant screeching of the young owls. Their food is principally mice, bats, and large moths.

14. ATHENE BOOBOOK.--Boobook Owl.

So called from its whoop resembling that sound. Like others of its genus it comes from its hiding place at sunset, and its note in the distance is exactly like that of the cuckoo, but the sound changes as you approach it. This bird has a dark brown plumage, spotted white, and differs in many respects from the genus Strix, although very closely allied to it.

15. AEGOTHELES NOVAE-HOLLANDIAE, VIG. AND HORSF.--Owlet night Jar.

This small bird, although a night bird, is very frequently seen in the day time, sleeping on the branch of a Casuarina, to which they appear to be partial. It is very common in the brushes of the Murray belt, and when disturbed has an awkward flight, as if it knew not where to go. Its plumage is very downy and soft, and it weighs exceedingly light.

16. PODARGUS HUMERALIS, VIG. AND HORSF.--Tawny-shouldered Podargus.

This singular bird is an inhabitant of the distant interior, and was seen on several occasions, but invariably near hills. The appearance of this uncouth bird is very absurd, with his enormous mouth that literally reaches from ear to ear, and his eyes half shut. Mr. Browne surprised five of these birds on a stone, on the summit of Mount Arrowsmith, about half a degree to the southward of the Depot. They were all sitting with their heads together, and all flew in different directions when roused.

17. EUROSTOPODUS GUTTATUS.--Spotted Goat-sucker.