WESTERN AUSTRALIA 207 



weary foodless land is met. They simply do not 

 carry on and in this way we get a barrier as shown 

 in map 89, 1^ 2^ 



Many species travel westward from the Carpen- 

 taria country with the hope of getting south of the 

 great sand-central. 



On the Nullabor Plain in the Australian Bight 

 many birds have travelled westward with the 

 embryo hope also of going north ; getting a similar 

 set-back in a similar form of trouble. Thus we get 

 two faunas separately kept apart. This is shown 

 in the text of map 89 by the example Melithreptus, 

 a genus of honey-eaters containing millions of 

 individuals in the four corners of the Common- 

 wealth. 



RELATIONSHIP WITH NORTHERN 

 QUEENSLAND 



The birds of the northern portion of West Aus- 

 tralia are closely related to those of North Queens- 

 land. Map 90 means that the birds of areas 8 and 

 1, map 1, are the birds of 3, 3, 4, while the birds of 

 3, 4, 5 have many species different from each other, 

 and a great number not found in 8, 7^, 1, 7^ Area 

 2 is the fountain head from which arose the birds 

 of areas 1 and 4. All these areas have a few species 

 quite their own, and for that reason they have their 

 own identity. The text of map 90 gives examples 

 of birds commonly found only in 8, 1, 2 : (1, 2, 3). 



