2 GO TROPICAL NATURE, AND OTHER ESSAYS. 



Here also we have one of the large yellow Ornithopterae 

 (0. magellanus), whose hind wings glow with an intense 

 opaline lustre not found in any other species of the 

 entire group ; and an Adolias 1 is larger and of more 

 brilliant metallic colouring than any other species in the 

 archipelago. In these islands also we find the extensive 

 and wonderful genus of weevils (Pachyrhynchus), which 

 in their brilliant metallic colouring surpass anything 

 found in the whole eastern hemisphere, if not in the 

 whole world. 



In the Andaman Islands in the Bay of Bengal there 

 are a considerable number of peculiar species of butter- 

 flies differing slightly from those on the continent, and 

 generally in the direction of paler or more conspicuous 

 colouring. Thus two species of Papilio which on the 

 continent have the tails black, in their Andaman re- 

 presentatives have them either red or white-tipped. 2 

 Another species 3 is richly blue-banded where its allies 

 are black ; while three species of distinct genera of 

 Nymph alidse 4 all differ from their allies on the continent 

 in being of excessively pale colours as w r ell as of some- 

 what larger size. 



In Madagascar we have the very large and singularly 

 white-spotted Papilio anterior; while species of three 

 other genera 5 are very white or conspicuous as compared 

 with their continental allies. 



Passing to the West-Indian Islands and Central 

 America (which latter country has formed a group of 



1 Adolias calliphorus. 



9 Papilio rhodifer (near P. doubledayi), and Papilio charicles (near P, 

 memnori). 3 Papilio mayo. 



4 Euplcea andamanensis, Cethosia biblis, Cyrcstis codes. 



5 Danais nossima, Melanitis mas^oura, Diadema dexithea. 



