THE WALL BUTTERFLY. 



123 



is absent on the fore wings in this sex, the central black trans- 

 verse lines are more distinct. 



Variation is chiefly in the size of the eyed spots ; sometimes 

 the apical one of the fore wings has a smaller one attached to its 

 lower margin, or in the interspace (i.e. between the veins) above 

 it or below it ; or both extra spots, which are usually without 

 white pupils, may be present. Very rarely the apical spot may 



Fig. 26. 



The Wall Butterfly just emerged from, the Chrysalis, and 

 with wing's distended. 



be almost absent on one fore wing, but well defined on the other. 

 The central transverse lines on the fore wings of the female are 

 sometimes broad, and very occasionally the space between the 

 lines is blackish ; blackish-banded male specimens are also 



