﻿THE ENTOMOLOGICAL MAGAZINE, Vol. III. Pt. I. 



are practically in accordance with the above laws, so hr as (a) and (b) 

 are concerned. This, however, is by no means the case with (c). True 

 it is that among the material of the present paper some instances were 

 met with, in which the upper surface is furnished with a spot whereas the 

 uwder surface has no trace of such marking in the corresponding inter- 

 space. But it appears to me that in such cases as these, some secondary 

 cause has hindered the development of the spot on the under surface. 



THE COMPONENTS OF AN EYE-SPOT. 



A typical eye-spot is composed of three components :- a pupil of bluish 

 white (which may be double), a space of black scales, and a halo of 

 yellow. On the under surface of the wings, they are usually surrounded 

 by the dark brown scales, which constitute the striations on the entire 



surface. In addition 

 to such typical spots 

 have we sometimes 

 some imperfect ones, 

 in wnich one or twx) 

 components are lack- 

 ing. The mark (C) 

 in Table II indicates 

 the interspaces in 

 which a perfect spot 

 almost invariably ap- 

 pears, and ( X ) those 

 sometimes provided 

 with an eye -spot 

 which are generally imperfect (See also Fig. 1 which represents the 

 locations of the eye-spots, under the supposition that all the adventitious 

 spots are formed in one and the same individual). Though such adventi- 

 tious spots are generally smaller and more irregular in shape than the 

 usual ones, yet almost perfect range of gradations is to be traced in tlieir 

 developinental stages. In a few cases they may be as large and as 

 perfect as the usual spots, while in other cases, their presence may be 

 indicated merely by a few scales. 



1. DiagrMmat 

 the ey, 

 :r (righ 



figure showing 

 der (left sid< 

 the wings. 



]e locations 

 and. the up- 



