A commonly found blue butterfly, measuring from one to one and a half
inches across the wings. It is rarely met with in England. The insect
has a slender tail at the lower angle of each hind-wing, surmounted by
two black dots. The margins of both wings have a slight black or dark
brown band. The under-sides of both wings are of a grey-brown colour
streaked and slightly spotted all over with faint white lines. On the
lower angle of each hind-wing the two black spots on the upper side
are replaced by two black ones dusted with silver, and surrounded by a
bright orange ring which is broader at the top than at the bottom.
The antennæ are brown, slightly sprinkled with white. It is found on
the rough fields (especially where the Lupine grows), barrancos, and
hedge-rows, between March and August. Specimens netted early in the
year are not so large as those found during May, and in the summer
months.