( 5 ) 



found in the extraordinary effect of one of the most dominant 

 and distasteful types of the Oriental Region upon characteristic 

 Ethiopian forms. Ethiopian species of Amauris, Salamis 

 and Pajnlio all exhibit the influence of Etiplo&a. It is most 

 unfortunate that the question was not studied many years ago 

 when the aspect of the country and the indigenous fauna were 

 comparatively vinchanged. As Colonel Manders suggests, we 

 might then, in all probability, have attained to a precise 

 knowledge of the selective forces by which the approach has 

 been brought about. 



In conclusion, Professor Poulton desired again to thank 

 Colonel Manders for directing the attention of the Society to 

 the deeply interesting problems presented by the faunas of 

 these two islands ; and personally he wished to thank him for 

 much kind help both in information and material. He had 

 also been greatly indebted to Mr, Roland Trimen, F.R.S., with 

 whom he had discussed the whole question, and from whom he 

 had I'eceived many valuable suggestions. 



Secondary Mimetic Resemblance of Ithomiin^ to the 

 Danaine genus Ituna. — Professor E. B. Poulton said that he 

 was indebted to the kindness of Mr. W. J. Kaye, F.E.S., for 

 the opportunity of exhibiting what seemed to him a very 

 interesting example of secondary mimicry. In 1898 he had 

 described and figured in the Zoological Journal of the 

 Linnsean Society (Yol. xxvi, p. 558) the great combination 

 of South American Lepidoptera which is ranged round the two 

 chief models Methona confusa, Butl., and Thyridia psiclii, L. 

 The combination included numbers of Ithomiinse, belonging to 

 several genera, two species of Ituna {Danainee), one of Pierinse, 

 and many Heterocera belonging to the Castniidse and Perico- 

 pidsd {Rypsidee). At the time when that paper was wi'itten he 

 had no conception of the predominance of secondary resem- 

 blances between mimics, and had naturally failed to find what 

 he never looked for. However, a few weeks ago he saw in Mr. 

 Kaye's collection the specimens now being exhibited, and at 

 viii] 



once realised that the Ithomiine Eutresis imitatrix, Stand., is an 

 exceedingly good secondary mimic of Ituna itself, the historic 

 mimic of Thyridia (and Methona) upon which Fritz Miiller 



i" 



