on. Milllerian Mimicry and Diaposematism. 575 



Zool. Soc. Lond., 1902, vol, ii, No. 257, Plate XXI, figs. 

 1-4). There is, therefore, no antecedent improbability in 

 the supposition that the corresponding aposeme in the 

 South American Pierines under discussion, less marked 

 but still conspicuous, should have been able to exercise an 

 influence upon the Heliconii. 



In Mr. Marshall's review of the genus Pereute (p. 108) 

 I find myself quite unable to follow him. I confess that 

 I do not understand his statement that it is only in his 

 third section " that we find any real mimicr3^" I should 

 have thought that mimicry if it exists at all must be real. 

 If he only means that some species are closer mimics than 

 others, of course I agree with him, but the remark in this 

 connection hardly seems worth making. As to the main 

 point, I do not think that any one who undertakes a 

 thorough examination of the genus in relation with other 

 butterflies of the Neotropical region can avoid coming to 

 the conclusion that every species of Pereute, even in- 

 cluding P. teltJivsa, displays mimetic features. Mr. 

 Marshall's South African experience will suggest to him 

 that to make the examination complete, the under-sides 

 must be included in the study; as indeed in one place he 

 seems to implyf 



The ^iTuler-side red spots in Archonias (o?* Euterpe) tereas 

 and Papilio zacynthus. 



Under this heading Mr. Marshall has — I am sure 

 unintentionally — given so complete a misrepresentation 

 of my published statements, that I can only suppose him 

 to have omitted to make himself fully acquainted with 

 them. It would, I think, be inferred by any reader of 

 his criticism that I had advanced the view that the 

 Pajnlios belonging to the colour-group of which P. zacyn- 

 thus may be taken as an example had adopted their under- 

 side red spots in mimicry of the associated Pierines (pp. 

 109, 110). How far such a supposition is removed from 

 my real opinion will be made sufficiently clear by an 

 extract from the very paper that Mr. Marshall quotes as 

 his authoiity, viz. my memoir on the Pierinse published 

 in our Transactions for 1894. In a note on page 285 of 

 that memoir occurs the following passage dealing with the 

 butterflies in question : — " The red basal patches on the 

 under-side of the Pierine give just the same general effect 

 as similar patches on the Papilio ; but a close scrutiny will 



