404 



Mr, A. G. Butler on the 





Philippine 

 Islands. 



< 



Admiralty 

 Islands. 



Fiji Islands. 



Friendly 

 Islands. 



Thanaos mornatua ...... 



Hypsa dama 



Cleis aruana 



ft t 



ft ft 



• ft 



ft • 



« * 



• • 



• • 



* 

 * 



* 



• • 



* 



• ft 



* 



f t 



ft • 



* 



• • 



* 



• t 



35 



i t 



* 



• • 



• 9 



• • 



2 



* 

 * 



15 



12 



alternata 



Cocvtodes modesta 



Phyllodes eerasifera .... 





41 



The most valuable series is that collected in the Aru Islands, 

 containing, among other species, a new Papilio allied to P. 

 Laglaizei of Depuiset (Ann. Soc. Ent. France, 1878, p. 142, 

 pi. v.), from New Guinea, but certainly quite distinct ; it is 

 an admirable copy of a clay-flying moth, Alcidis arum of 

 Felder, particularly as regards the pattern and coloration ol 

 the upper surface ; on the under surface, however, is a cha- 

 racter which strongly supports the view, held by Messrs. 

 Bates, Wallace, Trimen, and others, that resemblances of this 

 kind are due to the assimilation of species in need of protec- 

 tion to the pattern of others which, owing to their odour, taste, 

 or uneatable aspect, enjoy immunity from the attacks of insect- 

 enemies. This character consists in 



streak, so placed upon the abdominal area of the hind wings 

 as to simulate (when the butterfly is in repose) the orange 

 ventral surface of the abdomen in the moth ; the same character 

 may also be seen in the figure of P. Laglaizei. It the 

 Papiliones in repose retained the same flattened wing-surface 

 as do the species of Alcidis , it is obvious that the orange streak 

 would rather hinder than assist the r< emblance between the 

 two ; it is, however, well known that the abdominal border in 

 Papilio is in this position so folded that the streak would 



appear to be upon the body. 



One must not, however, overlook one fact in connexion 



a longitudinal orange 



