Order ARDEIF0BME8 
Family ARDEIDM. 
No. 249. 
DUPETOR FLAVICOLLIS OLIVEl. 
NORTHERN YELLOW-NECKED MANGROVE-BITTERN. 
Ardeiralla elavicollis olivei Mathews, Nov. Zool., Vol. XVIII., p. 234, 1912 ; 
Johnston River, North Queensland. 
Butoroides flavicollis Ramsay, Proc. Zool. Soc. (Lond.) 1877, p. 343. 
Dupetor gouldi Le Souef, Emu, Vol. II., p. 158, 1903. 
Dupefor flavicollis gouldi Hartert, Nov. Zool., Vol. XII., p. 204, 1905 ; Hall, Emu, 
Vol. VTI., p. 26, 1907 ; Mathews, ib., Vol. IX., p. 4, 1909 ; id., ib., p. 56 ; id., ib., 
Vol. X., p. 106, 1910. 
Ardeiralla flavicollis olivei Mathews, Nov. Zool., Vol. XVIII., p 234, 1912 (Johnston 
River, North Queensland) ; id.. Austral Av. Rec., Vol. I., p. 56, 1912. 
Ardeiralla flavicollis disneyi Mathews, Nov. Zool., Vol. XVIII., p. 234, 1912 (Parry’s 
Creek, North-west Austraha). 
Ardeiralla flavicollis melvillensis Mathews, Austral Av. Rec., Vol. I., p. 74, 1912 (Melville 
Island). 
Dupetor flavicollis olivei Mathews, List Birds Austr., p. 86, 1913 ; id.. Ibis 1914, p. 106. 
Distribution, North Queensland ; Northern Territory ; North-west Australia. 
Adult male. General colour above slate-black, with a metalHc sheen, including the 
head, back, wings, and tail ; the scapulars more inclining to brown and the 
quiUs to slate-colour ; outer edge of wing white, tinged with bu£E ; throat 
white, with a Hne of rufous feathers tipped with slate-grey running down the 
middle, and this line becoming black on the fore-neck, increasing in size and 
the feathers margined with white on the lower fore-neck and upper-breast ; 
sides of the neck orange-bufip ; cheeks mixed with rufous or buff, with a buff 
spot at the back of the gape ; abdomen dull slate-colour, more or less mixed 
with buffy-white. Bill : culmen black, remainder of upper mandible brown, 
lower mandible and lores light brown ; iris reddish-brown ; tarsi and feet 
brown. Total length, 540 mm. ; culmen 79, wing 217, tail 77, tarsus 69. 
Adult female. Similar to the adult male. These birds are darker than the southern 
ones. 
Young. Differs from the adult in having the feathers of the back and wings fringed 
with ochraceous-buff, as also the feathers on the sides of the face and hind- 
neck ; the feathers on the fore-neck ochraceous-brown instead of black, the 
sides of the neck buff, and the abdomen paler slate-grey, with ochreous or 
buff margins to the feathers. 
482 
