Sherry, will describe this better, but when I see a bright blue on the top of the wings when fully extended it is a male. Females are more of a dull metallic blue.

I can tell that they are Pipevines by their flight patterns, which is generally very fast and erratic. They seldom stay on a flower for any period of time. Every once and a while I will see them stay on a flower or branch for a while in the morning when they are drying out their wings.

Also, they are smaller than most other swallowtails.

Great! Thank You!!