140 CHALK HILL BLUE. 



inch and a quarter to an inch and a half. The male has the fore 

 wings of a most elegant pale metallic blue, with a cast of white; the 

 outer part of the front edge, and a broad border on the outside of the 

 wings, as also the veins, dusky black; there is a row of black dots almost 

 hidden by the wide border; the fringe is white, crossed by the veins, 

 ending in dots, and very wide, except on the front edge. The hind 

 wings are of a similar colour, with a similar broad border on the 

 outer part, the lower being removed, and shewing the black dots 

 distinctly, bordered by a line only of the former on the outside; the 

 dots are more or less ringed with silvery white; the border at the 

 front of these wings is broader than on the outside; the fringe is 

 white, and very wide. 



Underneath, the fore wings are pale greyish white, the margin defined 

 by a dusky line, through which the veins run and end in dots; near 

 the middle, towards the base, is a black dot, faintly ringed with 

 white, then another larger oblong central one, then an irregular 

 diagonal row of the like, the middle ones being the largest, and the 

 lower two close together, then another row of smaller and rather 

 fainter ones, succeeded by another: the fringe is white, intersected 

 by the veins. The hind wings are greenish blue about the base, and 

 generally of a pale greyish brown hue, the whitish grey occasionally 

 breaking through, esjiecially near the lower corner; the fringe is white, 

 marked off by a marginal dusky line; these wings are much spotted 

 with a variety of spots and dots, some of them eyed with white, some 

 of the lower ones of a dull orange colour. 



The female has the fore wings of a dark bronzed brown, with more 

 or less phosphorescence of blue; near the centre is a small white spot, 

 with a black pupil ; the fringe is dull white, the veins crossing it 

 ending more widely : there is a row of obscure light-coloured dots 

 within the margin. The hind wings are of the same ground-colour, 

 but there is more of the blue tinge, at least in some specimens; they 

 also have a small white spot in their centre: the margin is dull white, 

 crossed by the veins, and within it is a row of black dots, partially 

 encircled on the inner side by orange, and these again followed, at 

 least in some individuals, by small bluish triangular-shaped marks. 



Underneath, the wings are similarly marked to those of the male, 

 but the ground-colour is very much darker, the spots much larger 

 and more distinct, with white rims, and there are some orange marks 

 within the margin of the fore wings, and a decided row of orange 

 lunules within that of the hind ones. 



The caterpillar is green, with yellow lines on the sides and the 

 back. 



