KDOdiledge & SeleDtifie flems 



A MONTHLY JOURNAL OF SCIENCE. 



Conducted by MAJOR B. BADEN-POWELL and E. S. GREW, M.A. 



Vol. II. No. i. 



[new series.] 



JANUARY, 1905. 



r Entered at -1 

 LStationers' Hall. J 



SIXPENCE. 



CONTENTS.-^See Page VII. 



Dimorphic Mimicry 

 ©Lmong Bvitterflies. 



Perhaps the most striking instances of true mimicry 

 are those which may be described as dimorphic. Not 

 infrequently, but for reasons which are generally very 

 obscure, the sexes of a butterfly differ so widely in 

 colours and markings that the casual observer would 

 certainly take them for representatives of distinct 



species. And when such a difference exists between 

 the male and female of a well-protected butterfly which 

 is a prototype for mimicry the male and female of the 

 mimicking species are sometimes seen to have each 

 followed out, almost line for line, the colour charac- 

 teristics distinguishing the sexes of the distasteful 

 insect. This is well shown in the case of Euplcea 

 linnet and Elymnias leucocyma from Assam. The males 



of both these species have shining blue fore-wings, 

 spotted with white; the fore-wings of the females have 

 a circumscribed blue area, spotted with white, while 



Bahora aspasia c? and ?- Ex Sumatr 



