SYSTEMATIC REVISION OF THE AUSTRALIAN THORNBILLS 97 
Bass Strait. Thus, it is clear that ewingi is not confined to the 
mountainous country of Tasmania, hut is found throughout 
the range of two races of pusilla, and in view of the marked 
and constant difference in colouration between it and all forms 
of pusilla , specific rank is plainly warranted. 
Fig. 2. Distribution. 
2, Acanthisa ewingi. 
Compared with any race of pusilla , this species differs in 
lacking any indication of a light subterminal band on fore- 
head feathers; in having a conspicuous snuff brown wing 
patch, bounded on two sides by fuscous black ; in colour of 
ventral surface, the upper part of which is greyish, without 
distinct darker striations, and the lower portion is more 
clearly white with pure white under tail-coverts, in marked 
contrast to the buff under tail-coverts of pusilla. In dimen- 
sions it averages more in length of tarsus. 
The single specimen from King Island for which A. J. 
Campbell proposed the name rufifrons is typical ewingi. 
There are numerous smaller islands in Bass Strait and near 
the coast of Tasmania where ewingi and the preceding species 
are probably present, but definite records are wanting. 
G 
