The young differ considerably from the adult, having the feathers of the head and back of the neck dark brown, margined with rufous brown; the remainder of the upper surface deep brown, each feather with a crescent-shaped mark of rufous at the extremity; tail brown, crossed with obscure bars of a darker tint, and tipped with whitish brown; inner webs of the primaries fawn-colour, barred with dark brown; throat buffy white, with a stripe of dark brown down the centre of each feather; breast buffy white, each feather crossed by two bands of dark brown, the last of which assumes a triangular form; abdomen and flanks buffy white, crossed by irregular bands of dark brown, which are blotched with rufous brown in the centre; thighs and under tail-coverts pale rufous, crossed by similar bands; irides beautiful yellow; cere, base of the bill and gape bluish lead-colour; point of the bill blackish brown; legs gamboge-yellow. The Plate represents an adult male and female of the natural size. [Illustration: ASTUR CRUENTUS: _Gould_. _J. Gould and H. C. Richter del et lith._ _Hullmandel & Walton Imp._ ] ASTUR CRUENTUS, _Gould_. West-Australian Gos-Hawk. _Astur cruentus_, Gould in Proc. of Zool. Soc., 1842. _K̏il-lin-g̏il-lee_ and _Mat-wȅl-itch_, Aborigines of the mountain districts of Western Australia. _Goȍd-jee-lum_, Aborigines around Perth, Western Australia. This Hawk is intermediate in size between the _Astur approximans_ and _Accipiter torquatus_; it is of a more grey or blue colour on the back, and has the transverse lines on the breast narrower and of a more rufous tint. It precisely resembles the first-mentioned bird in the rounded form of the tail, in the short powerful tarsus, and in the more abbreviated middle toe, which is much longer in the _Accipiter torquatus_. The _Astur cruentus_ is a very common species in Western Australia, particularly in the York district and at the Murray. Like its congener, it is a remarkably bold and sanguinary species, often visiting the farm-yard and carrying off fowls and pigeons with much apparent ease. It breeds in October and the two following months, making a nest of dried sticks on the horizontal fork of a gum or mahogany tree. The sexes and young present precisely the same differences, both in size and plumage, that are observable in their near ally.