These are pretty little butterflies.  Their wingspan seldom gets much over an inch at full extension.  You see them as bright flashes of blue as the males fly around but they flicker out and disappear as soon as they land leaving the more dull underside of their wings on display.

I caught this one at just the right moment to see the full display.  The next shot shows the closed wings and the much less flashy exterior that makes them hard to find at rest.

The females are still blue but a bit less flashy.