258 TROPICAL NATURE, AND OTHER ESSAYS. 



darker and more brilliant hues, and often accompanied 

 by an unusual increase of size. Thus in the Moluccas 

 and New Guinea we have several Papilios (P. euchenor, 

 P. ormenus, and P. tydeus) distinguished from their allies 

 by a much paler colour, especially in the females which 

 are almost white. Many species of Danais (forming 

 the subgenus Ideopsis) are also very pale. But the 

 most curious are the Euploeas, which in the larger 

 islands are usually of rich dark colours, while in the 

 small islands of Banda, Ke', and Matabello at least three 

 species not nearly related to each otlier (E. hoppferi, 

 E. euripon, and E. assimilata) are all broadly banded 

 or suffused with white, their allies in the larger islands 

 being all very much darker. Again, in the genus 

 Diadema, belonging to a distinct family, three species 

 from the small Aru and Kd islands (D. deois, D. hewit- 

 so?rii, and D. polymena) are all more conspicuously 

 white-marked than their representatives in the larger 

 islands. In the beautiful genus Cethosia, a species from 

 the small island of Waigiou (C. cyrene) is the whitest 

 of the genus. Prothoe is represented by a blue species 

 in the continental island of Java, while those inhabiting 

 the ancient insular groups of the Moluccas and New 

 Guinea are all pale yellow or white. The genus Drusilla, 

 almost confined to these islands, comprises many species 

 which are all very pale ; while in the small island of 

 Waigiou is found a very distinct genus, Hyantis, which, 

 though differing completely in the neuration of the 

 wings, has exactly the same pale colours and large 

 ocellated spots as Drusilla. 



Equally remarkable is the increase of size in some 

 islands. The small island of Amboina produces larger 



