The common blue is a butterfly every watcher should commit to memory -
blues are readily identified by how they differ from this standard
species. The upperside of the male has a narrow black border (though it
is wider in some forms)and is otherwise largely unmarked. The underside
of both sexes is a typical jewelled 'polyommatine' pattern, with a spot
in the middle of the cell. Females are generally brown, with some blue
scaling towards the bases of the wings and orange submarginal lunules.
However, in some places very blue female forms may be found.