THE HOLLY BLUE. 173 



faint ; there is a series of black dots on the outer margin of the 

 wings. 



Although the colour of the upper side is somewhat like that 

 of the Common Blue, it should not be confused with that 

 species, as the under side is very different both as regards the 

 colour, which is bluish-white, and the arrangement of the 

 black spots. On the outer margins of the wings in some 

 specimens there are more or less distinct traces of blackish 

 crescents. 



There is no considerable variation in this species, but the 

 spots on the under side are subject to slight modification in the 

 matters of size and shape ; the borders also vary in width, and 

 in the female the blue area is thus sometimes much restricted. 

 A gynandrous specimen has been recorded, in which the right 

 side is male. 



The egg (Plate 112) is described as whitish or bluish-green 

 in colour. 



The full-grown caterpillar has a blackish head, the body is 

 bright yellowish-green with paler lines ; eight rings from and 

 including the second are crested with two ridges of humps, 

 between which lies the sunk dorsal space ; the whole skin of 

 the body is velvety, with its surface thickly covered with 

 yellowish warty granules, each bearing a minute bristly white 

 hair. Sometimes the humps and the middle of the back are 

 marked with rose-pink. 



The chrysalis is pale brownish-bchreous with a thin blackish- 

 brown line on the back of the brown freckled thorax ; the 

 body is marked with rather blotchy arrow-head dashes, and 

 some larger dark brown blotches ; the wing-cases are pale 

 greyish freckled and outlined with brown, their surface is 

 smooth and rather more glistening than the other parts, which 

 are thickly studded with fine, short, brownish bristles. (Adapted 

 from Buckler.) 



The following is a brief summary of a paper by Mr. R. Adkin 



