Thanks, guru! :grin2:
Yes, as most of us know, this species flies around like it is jet-propelled and the only chance is the 1/2 or 1s stops at flowers, particularly for the females. For this species, the males generally have very thin marginal borders whilst the females have thick borders on both the fore and hindwings.
In our field guide, on pages 28/29, you can see the different forms of males and females. The gender of the butterflies is shown on the side of the photos (in very small lettering).