WESTERN AUSTRALIA 215 



Naretha Parrot of H.L. White, keeping to the west- 

 ern side of the plain. 



B B is where the northern and southern birds 

 meet, and A A is where the real tropical birds 

 refuse to go beyond. The few dry-country species 

 of birds locate themselves at E. 



UNUSUAL COMBINING OF AREAS 

 (Plate 3, Figs. 84, 90) 



The country between the Gascoyne and Ashbur- 

 ton districts is a no-birds land. Most of the species 

 north of it do not go south, just as we find the 

 reverse. Migratory birds are excepted. 



The Tit-Warblers (Acanthiza) and Scrub-Wrens 

 (Sericornis), embracing fifty species and races, are 

 with one or two exceptions, all southern. 



A bird connecting these two genera by its plum- 

 age and habits is the Red Throat (Pyrrholaemus). 

 Strangely enough it is found in both areas, extend- 

 ing to New South Wales in the south, but not 

 extending in the north to Queensland. 



As a set off against this theory of a south east 

 origin we have the Brown Flycatcher (Microeca 

 assimilis) distributed over the whole of Western 

 Australia as shown in map 97, and having a north- 

 east origin. These are coastal examples of birds 

 being common to the two coastal areas. 



In the inland sub-region (Eyrean) 7^ 7*, map 1, 

 we have the Rufous Tree-creeper as a good 

 example of a species occupying the three areas 



