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Ch. XXX\IIL] 



MAMMALIA OF AUSTEALIAN EEGIOX. 



34 



/ 



Islands and Bali or tlie wliole of tlie Indian region (see map^ 

 fig. 132) • To this question of a modern geographical change 

 we shall again refer. 



In regard to the birds of the mainland^ the genns Euploca- 

 onus of the pheasant family affords a good illustration of a 

 variable form. Thus E. melanotusy or black-backed kalige of 



Fig. 132. 



Map sho\ying the boundaries of two great zoological provinces, the Indian and 

 the Australian, as defined by Alfred B. Wallace, Esq. The lands ^Yhich are shaded 

 belong to the Australian, the unshaded to the Indian reo-ion. 



ah. Line exceeding 100 fathoms in depth 



separating the Indian and Australian zoologi- 

 cal region. 



c d. Boundary line between the Kalayan 



and Papuan races, showing their near coinci- 

 dence with the range of species of the inferior 

 animals (see Chap. XLIII.). 



Sikkiin, is found to pass bj numerous varieties in tlie inter- 

 mediate Aracan countr j into the K Uneatus of Tenasserim and 

 Pegu. The varieties are considered by Dr. Sclater not to be 



Australian region- 



Malay 



Mr. Wallace on its limits with the 



come 



men 



w 



