( 17 ) 



Ixxxi] 



the S.W., and everywhere eastward from the N.E. shoi-es of 



the Lake to the coast, the dorippus form was more abundant 



than the type form, and that in all his experience he had never 



received from any of these localities such a group as that now 



exhibited. 



1 .n Wednesday, November 18th, 1908. 



IxxxviJ ' ' ' 



Identity of Charaxes. — Dr. Karl Jordan exhibited ex- 

 amples of Charaxes zoolina, and its nearest allies, C. hetsimi- q 

 saraka and betanimena from Madagascar, zoolina and neanfhes 

 Ixxxvii] 



from East Africa, phanera and ehmhei from West Africa, 

 kahldeni and homeyeri from West Africa. This exhibit con- 

 firmed the result of Mr. G. F. Leigh's breeding experiment 

 mentioned by Professor E. B. Poulton at the last meeting, 

 xci] 



Mimetic belatiox between Colaenis telesiphe, Hew., 

 Heliconius telesiphe, Doubl., and Pereute antodyca, Boisd. / 

 — Dr. F. A. DiXEY exhibited specimens of the genei'a Colaenis, 

 Heliconius and Pereute, remarking, upon them as follows : — 



"In his recently-published 'Essays on Evolution,' Prof. , ^^ 

 Poulton has drawn attention to the close resemblance between 

 the Nymphaline Colaenis telesiphe. Hew., and the Heliconine 

 //. telesiphe, Doubl. He notes (l. c, p. 334) that the Colaenis 

 has departed widely from the usual aspect of its genus, while 

 the Heliconius is not far removed in appearance from many 

 of its nearest allies. On these grounds, which are well illus- 

 trated by the specimens of both genera here exhibited, we 

 must, as he says, consider C. telesiphe the mimic and H. 

 telesiphe the model. But, as Prof. Poulton further remarks, 

 thei'e is evidence that the Colaenis is the commoner insect of 

 the two ; and this cii-cumstance, reinforced by F. Miiller's 

 observation of stink-glands in Colaenis, favours the Miillerian 

 interpretation of the relation between these insects. 



" Accepting Piof . Poulton's view of the case, which indeed 

 it would be very difficult with our present knowledge to 

 controvert, I wish to draw attention to another fact, which 

 also can easily be verified by reference to the present specimens. 

 This is that whereas the upper and under surfaces of the 



