SYSTEMATIC REVISION OF THE AUSTRALIAN THORNBILLS 109 
failed to find anything unusual in the shape and size of the 
bill, notwithstanding it was referred to in naming the species, 
and has been used even as a generic character. In structure 
and measurements robustirostris is very similar to other 
species of the genus. 
No difference is apparent between specimens from the type 
locality and those from Everard Ranges and elsewhere in 
Central Australia. The rainfall and general conditions being 
similar at and between these two points, racial differences are 
not to be expected. The author of M. r. liberia has consigned 
that name to synonvmy (Mathews, Birds of Aust., ix, 1922, 
p. 462). 
ACANTHIZA NANA Vigors and Horsfield. 
Six types and one paratype of the nine forms named have 
been available to me and it is clear that only four subspecies 
are warranted. In this species it is the inland pallid form, 
A. n. modesta (type of dawsoniana ) , that is represented in a 
collection from the lower Dawson River, Queensland. 
Acanthiza nana nana Vigors and Horsfield. 
Acanthiza nana Vig. and Horsf., Trans. Linn Soc., xv, 1827, p. 226; 
Sydney, New South Wales. 
Acanthiza nana clorotheae Mathews, Emu, xiv, 1914, p. 60; Lithgow, 
New South Wales. 
Acanthiza nana clelandi Mathews, ib., p. 121 ; new name for preceding. 
Acanthiza nana belltrees A. G. Campbell, Emu, xxii, 1922, p. 64; Scone, 
New South Wales. 
Range. — South-eastern Queensland to south of Sydney, New South Wales. 
Specimens Examined. — Twenty-three from the following localities: 
Queensland: Gowrie. New South Wales: Scone (type of belltrees), Black- 
town, Woolahra, Narrabeen, various localities vicinity of Sydney, Liverpool, 
Lithgow (type of dorotheae) . 
Measurements. — Twenty-two adult specimens of both sexes: wing, 47-52 
(49); tail, 34-39 (35 6); exposed oilmen, 7-8 5 (7 9); tarsus, 15-17 
(16 5). 
Male. — Dorsal surface olive citrine to yellowish citrine on rump and upper 
tail-coverts, with crown tinged huffy and forehead straw yellow; indistinct 
superciliary stripe citron yellow ; feathers of lores and cheeks straw yellow with 
dusky tips, and those of the ear-coverts dark brown with shafts straw 
yellow; wings fuscous, margins of coverts and outer margins of inner 
secondaries olive-citrine to dull citrine, outer margins of remainder of wing- 
quills citron yellow ; tail hair brown with outer webs basally and outer 
margins distally yellowish citrine, the whole crossed by a broad subterminal 
band of black which is reduced to large spots on the two central feathers; 
