SYSTEMATIC REVISION OF THE AUSTRALIAN THORNBILLS 89 
As the type locality is close to the southern extremity of 
the range of this form, some birds from the vicinity of Sydney 
resemble the adjoining race to the south ( macularia ), but 
specimens from south Queensland and localities north of 
Sydney are typical. The type and only specimen of dawson- 
ensis differs from pusilla in its lighter lower under surface, 
and in having a narrow white margin towards the tip of inner 
w T eb of lateral tail feathers, thus approaching albiventris. In 
depth of tail band and general upper colouration it is similar 
to pusilla and possibly the differences noted are the result of 
intergradation with albiventris, but adequate series from 
coastal eastern Queensland are essential for an understanding 
of the relationship of the three races of pusilla and other 
species in the vicinity of Rockhampton. 
Acanthiza pusilla katherina De Vis. 
Acanthiza katherina De Vis, Ann. Queensld. Mus., No. 6, 1905, p. 43 ; 
Bellenden Ker Range, Queensland. 
Range. — From about Cairns to south of Cardwell, north-eastern Queens- 
land. 
Specimens Examined. — Fifteen from Bellenden Ker Range, Ravenshoe, 
and Herberton district. 
Measurements. — Five specimens of both sexes: wing, 51-55 (53'2) ; tail, 
42-44 (42-8) ; exposed culmen, 9-9 '5 (9 2) ; tarsus, 17-18 (17 2). 
Subspecific Characters. — Differs from all other races of pusilla in the rich 
greenish colour of the dorsal surface, olive to dark olive ; feathers of forehead 
deep olive-buff, rather than tawny as in typical pusilla ; dark throat striations 
much less prominent, and remainder of ventral surface yellowish, deep olive- 
buff to dark olive-buff on flanks. 
Although a distinct and easily recognized form, specific 
separation of katherina is not warranted. The lack of material 
noted under typical pusilla applies equally to this race, and 
while it is probable that the range of katherina extends con- 
siderably south of Cardwell, specimens have yet to be obtained. 
Acanthiza pusilla macularia (Quoy and Gaimard). 
Saxicola macularia Quoy and Gaimard, Voy. Astrol., i, 1830, p. 199; 
Western Port, Victoria. 
Acanthiza pusilla samueli Mathews, Aust. Av. Rec., ii, 1913, p. 76; 
Myponga, South Australia. 
Acanthiza pusilla cambrensis A. G. Campbell, Emu xxii, 1922, p. 63; 
Cape Jervis, South Australia. 
Range. — From south-eastern New South Wales, through southern Vic- 
toria to the vicinity of Adelaide, South Australia. 
