Order PASSERIFORMES. 
No. 27. 
Family MUSCICABIDE. 
PACHYCEPHALA XANTHOPROCTA. 
NORFOLK ISLAND THICK-HEAD. 
(Plate 23.) 
Pachycephala xanthoprocta Gould, Synops. Birds Austr. and Adj. Isl., pt. iii., pi. 55, April 
1838: New South Wales error=Norfolk Island. 
Pachycephala xanihoprocta Gould, Synops. Birds Austr. and Adj. Isl., pt. iii., pi. 55, April 1838; 
Gadow, Cat. Birds Brit. Mus., Yol. VIII., p. 211, 1883 (pref. June 28th); Mathews, 
Handl. Birds Austral., p. 86, Jan. 1908 ; id., List Birds Austr., p. 322, Dec. 1913 ; Mathews 
and Iredale, Austral. Av. Rec., Vol. IV., p. 110, Dec. 16th, 1920. 
Pachycephala longirostris Gould, Synops. Birds Austr. and Adj. Isl., pt. iii., pi. 55, April 1838: 
New South Wales error=Norfolk Island. 
Pachycephala gatturalis xanihoprocta Mathews, Nov. Zool., Vol. XVIII., p. 449, Jan. 1912. 
Distribution. Norfolk Island. 
Adult male. Fore-head, crown of head, occiput and nape dull grey, slightly tinged with olive; 
lores whitish ; scapulars, hind-neck and lower back dull olive ; rump and upper tail-coverts 
greenish-olive ; lesser, median and greater coverts dull olive, outwardly margined with 
yellowish-olive ; primary-quills hair-brown on the inner web and margined on the outer 
w r eb w r ith yellowish-buff; tail-feathers ash-grey, broadly margined with greenish-olive; 
sides of the face, ear-coverts, cheeks, chin and throat greyish-white, faintly tipped with 
brown, producing an indistinct barred appearance ; sides of neck, fore-neck, chest, breast, 
abdomen, sides of body, flanks and thighs light primrose-yellow ; under tail-coverts bright 
yellow'; under wlng-coverts and axillaries greyish-white. Bill black, eyes dark brown, feet 
brownish-black. Total length 167 mm. : culmen 16, wing 99, tail 75, tarsus 26. Figured. 
Collected at Stockyard Creek, Norfolk Island. 
Adult female. Crown of head and occiput ashy-grey; scapulars, nape, hind-neck, lower back, 
rump and upper tail-coverts greenish-olive, brightest on the rump and upper tail-coverts; 
lesser and median wing-coverts dull olive, tipped with whitish, forming a bar on the 
greater coverts; quills greyish-ash, margined on the outer web with olive-brown; tail- 
feathers bright greenish-olive, with the shafts blackish-brown: cheeks, cbm and throat 
whitish, indistinctly barred with ashy-brown and suffused with pale buff; sides of the 
neck and fore-neck, chest, breast, abdomen, sides of the body, flanks and thighs yellow, 
suffered with pale buff; under tail-coverts bright yellow'; under wlng-coverts and 
axillaries buffish-w'hite; quills below ash, widely margined on the inner web with whitish 
buff. Bill black, greyish at the base, eyes reddish-brown, feet dark bluish-grey. Total 
length 175 mm.: culmen 15, wing 95, tail 76, tarsus 26. Figured. Collected at Kingston, 
Norfolk Island, on the 9th of May, 1913. 
Immature male. The whole of the head dark grey, tinged with olive; back, scapulars and 
rump) brighter than the head ; upper tail-coverts greenish-olive; primary-quills brownish- 
ash ; the outermost ones margined on the outer web with whitish-buff, the innermost 
ones with reddish chestnut; secondaries brownish-asli, broadly margined on the outer 
web with reddish-chestnut; tail-feathers brownish-olive with the outer webs bordered 
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