( Ixiii ) 



other Kauai species gaining the dark iridescent wings of 0. 

 radula, the latter gaining their yellow bands. 



(4) The red-marked Group III (= D) arose in Lanai, 

 Molokai or Maui, soon became common to all thiee, and, by 

 accidental transport, was carried to all the other islands. The 

 members that reached Hawaii have been nearly absorbed into 

 its one dominant black group. The two allied species on 

 Kauai are the result of an iuter-island immigration so recent 

 that neither of the Colour-groups has affected the other. 



(5) Tn Oahu, nearest to Kauai, traces of the original banded 

 pattern were more evident (in members of Colour-group II 

 (= B), and especially in IV) than on any other island except 

 Kauai. The red-marked Group III arose under the influence 

 of immigrants from Molokai, etc., while in other species (in 

 Group II) the same character has tended to disappear, 

 probably under the influence of the black Group I (= E), 

 derived from Hawaii. 



(6) It was not to be expected that the members of a Colour- 

 group formed on any island, would, after reaching another 

 island, always produce a group exactly like that in which they 

 originated. The immigrants would be working upon different 

 material, and would also be likely themselves to undergo 

 changes of pattern. The » peculiarity of the red-marked 

 Group III (= C) on Oahu may perhaps be thus explained. 

 Especially may changes be expected to occur in an appear- 

 ance, like that of the wings, due to a uniform dark pigment 

 combined with the " structural colours " of thin plates. 



That there was undoubtedly a strong tendency to produce a 

 single group on a single island was shown by the condition of 

 Hawaii and Kauai, at opposite ends of the chain, and it was 

 suggested that the same tendency existed in the other islands, 

 but had been masked by the effect of accidental inter-island 

 immigration. 



Certain classes of facts established by Dr. Perkins, and 

 described in his paper, were only intelligible on the hypothesis 

 of mimetic approach due to selection by enemies attacking by 

 the aid of sight. 



(1) The persistence, in certain individuals belonging to the 

 black Group I, of yellow bands on the under-surface where 



