SYSTEMATIC REVISION OF THE AUSTRALIAN THORNBILLS 95 
Eyre Peninsula. The single specimen from Kychering, South 
Australia, described by A. G. Campbell under A. apicalis 
erema, is immature and in poor condition, but obviously is to 
be referred here. 
Acanthiza pusilla apicalis Gould. 
Acanthiza apicalis Gould, Birds of Aust., iii, 1847, pi. 57 ; Swan River, 
Western Australia. 
Range. — South-west Western Australia, approximately west of a line 
between Geraldton and Israelite Bay, except extreme south-west. 
Specimens Examined. — Thirty from the following localities: Doodlakine, 
Kellerberrin, Guildford, Perth, Kelmscott, Kalamunda, Mandurah, Dumble- 
yung, Gnowangerup, Broome Hill, Tenterden, Gordon River, Stirling Ranges. 
Measurements. — Thirty adult specimens of both sexes: wing, 49-54 
(517); tail, 43-50 (46 5); exposed culmen, 8 5-9 5 (8 9); tarsus, 17 5- 
19-5 (18-6). 
Subspecific Characters. — Resembling whitlocki but darker above, hair 
brown tinged buffy olive, and upper tail-coverts buffy to olive brown; much 
darker, dark olive-buff to buffy brown on flanks and under tail-coverts. Extent 
of white at tips of inner web of tail feathers less than in whitlocki and albi- 
ventris, and tail-band (8-10 mm.) intermediate in depth between these two 
inland forms (12-14 mm.) and remaining coastal and insular races (6-7 mm.). 
In colouration and depth of tail-band specimens from the 
north and south of the range of this form approach whitlocki 
and leeuwinensis respectively, thus affording ample evidence 
of intergradation. 
Acanthiza pusilla leeuwinensis A. G. Campbell. 
Acanthiza pusilla leeuwinensis A. G. Campbell, Emu, xxii, 1922, p. 63 ; 
Wilson’s Inlet, Western Australia. 
Acanthiza pusilla northi Mathews, Birds of Aust., ix, 1922, p. 431 ; 
Wilson’s Inlet, Western Australia. 
Range. — Forest country of extreme south-west Western Australia. 
Specimens Examined. — Twenty-nine from the following localities: Albany, 
Torbay, Denmark, Wilson’s Inlet (type of leeuwinensis) , Irwin’s Inlet, Bald 
Island, Augusta, Ellensbrook, Cape Naturaliste, Bunbury, Harvey River, 
Wandering. 
Measurements. — Twenty-eight adult specimens of both sexes : wing, 48-55 
(50 8); tail, 42-53 (45 3); exposed culmen, 8- 5-9- 5 (9); tarsus, 18 5-20 
(18-8). 
Subspecific Characters. — This race differs from all other forms in the rich 
brownish colour of the upper parts, flanks, and under tail-coverts. It is similar 
to other coastal and insular races in depth of tail-band (6-7 mm.). Dorsal 
surface olive brown; feathers of forehead with buffy brown subterminal 
bands ; upper tail-coverts snuff brown ; flanks and under tail-coverts clay 
colour to tawny-olive. 
