CHESTNUT-BACKED GROUND-BIRD. 
and upper-breast glossy black which extends in a line along the sides of the 
lower-breast ; lower-breast, middle of abdomen, vent and under tail-coverts, white 
irregularly marked with black ; marginal under wing-coverts white with irregular 
dark markings, the inner ones greyish-brown like the under-surface of the flight- 
quills ; lower aspect of tail blackish with white tips to the feathers. Bill black, 
eyes warm brown, feet lead-grey. Total length 240 mm. ; culmen 15, wing 101,’ 
tail 101, tarsus 34. Figured. Collected at Lake Dundas, West Australia, on the 
16th of July, 1905, and is the type of Cinclosoma castanotum dundasi. 
Adult female. General colour of the upper-surface greyish-brown tinged with rufous, 
including the top of the head, sides of the face, sides of neck, back, scapulars and 
rump ; upper tail-coverts grey, somewhat darker on the middle of the feathers ; 
upper wing-co-verts like the back with white tips to the feathers the inner webs of 
the greater series blackish ; bastard-wing and primary-coverts black tipped with 
white ; flight-quills blackish-brown irregularly marked with white on the outer webs 
of some of the primaries and white at the base of all of them ; middle tail-feathers 
rather darker than the back ; the outer ones black broadly tipped with white ; a 
supraloral streak of white which extends over the eye and along the sides of the 
crown ; chin and a line on each side of the throat white, which extends on to the 
sides of the neck ; throat, fore-neck, breast and sides of breast slate-grey ; abdomen, 
vent and under tail-coverts white, extensively marked with brown on the last ; 
thighs and bases of the feathers of the abdomen and vent dusky-grey ; sides of body 
similar to the back ; axillaries and under wing-coverts white, the greater series of the 
latter greyish-brown like the under-surface of the quills ; lower aspect of tail blackish 
with white tips to the feathers. Bill purple-horn ; eyes red-hazel ; feet and legs 
bluish-purple.. Wing 96 mm. ; culmen 15, tail 93, tarsus 30. Figured. Collected 
at Broome Hill, South-west Australia, on the 10th of August, 1 908. 
Immature male. Crown of head, hind-neck and upper back pale chestnut-brown tinged 
with grey and blackish edgings, or centres, to the feathers becoming uniform chestnut 
on the lower back and rump ; upper tail-coverts greyish-brown ; lesser and median 
upper wing-coverts. greyish-brown with white lanceolate markings at the tips; the 
greater series blackish with buff outer margins, becoming whitish at the tips of the 
feathers ; bastard-wing and primary-coverts blackish edged and tipped with white 
on the apical portion ; flight-quills also blackish with white bases to the primaries 
on the outer webs and narrow whitish edgings on the apical portion, outer margins 
of secondaries rufous-brown ; middle tail-feathers dark brown becoming darker on 
the lateral feathers which are broadly tipped with white ; a white superciliary line 
from the hinder portion of the nostrils over the eye and widening out on the sales of 
the crown ; feathers in front and below the eye brown with pale shaft-streaks to 
the last ;. lower cheeks, chin and throat, white with dark margins to the feathers ; 
breast, sides of breast, sides of body and thighs with dark edges to the feathers ; 
abdomen and vent white ; under tail-coverts white on the inner webs and greyish- 
brown on the outer ones ; under wing-coverts for the most part white, with a few 
greyish feathers on the greater series ; under-surface of flight-quills pale brown with 
pale inner edges ; lower aspect of tail blackish-brown with white tips to the feathers. 
Eyes hazel, feet and legs grey ; bill purple-flesh. Collected at Broome Hill, South- 
west Australia, on the 18th of November. "j06. 
Male fledgeling. Crown of head, hind-neck, sides of neck, and mantle ochreous-brown tinged 
with grey and dark fringes to the feathers, which are wider and more conspicuous 
on the mantle ; lores and a broad line over the eye white ; the nestling down is still 
adhering to the feathers on the sides of the crown, hind-neck, and the sides of the neck 
which are dusky-brown in colour ; ear-coverts dark brown with slightly paler shaft- 
lines ; scapulars and feathers of the back tinged with dull chestnut-brown and 
broadly margined with black ; rump uniform chestnut-brown ; upper tail-coverts, 
189 
