I am listing this very distinctive subspecies (it was a full species in the 1926 Checklist) to draw attention to it. Not only do Western Whitefaces look different to eastern Australian birds, the songs are quite different but unfortunately I have so far failed to record the western ones.

There is a very narrow band of intermediates between western and eastern birds in the region of the western Nullarbor Plain. This is shown clearly in a figure and discussed in detail on pages 92-93 in the excellent Handbook of Western Australian Birds, Vol.II.