192 THE MALAYAN PAPILIONIDJE AS 



are either almost or entirely restricted to one portion 

 of the archipelago : 



IndO'Malayan Region. Austro-Malayan Region. 



Nox-group. Priamus- group. 



Coon-group. Ulysses -group. 



Macareus-group (nearly). Erechtheus-group. 



Par adoxa - group . 

 Dissimilis-group (nearly). 

 Broo keanus - group . 

 LEPTOCIECTJS (genus), 



The remaining groups, which range over the whole 

 archipelago, are, in many cases, insects of very power- 

 ful flight, or they frequent open places and the sea- 

 beach, and are thus more likely to get blown from 

 island to island. The fact that three such character- 

 istic groups as those of Priamus, Ulysses, and Erech- 

 theus are strictly limited to the Australian region of 

 the archipelago, while five other groups are with equal 

 strictness confined to the Indian region, is a strong 

 corroboration of that division which has been founded 

 almost entirely on the distribution of Mammalia and 

 Birds. 



If the various Malayan islands have undergone 

 recent changes of level, and if any of them have been 

 more closely united within the period of existing 

 species than they are now, we may expect to find 

 indications of such changes in community of species 

 between islands now widely separated ; while those 

 islands which have long remained isolated would have 

 had time to acquire peculiar forms by a slow and 

 natural process of modification. 



