Looks like a pipevine.

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Beautiful! I agree it's a Pipevine Swallowtail. The blue on their lower wings is so pretty when the sun hits it just right.
Do you know what the plant is that it's nectaring on? Some type of verbena maybe?
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Thanks to both of you for the id and the photo info. It is feeding on verbena but it really loved the lantana. It stayed in the yard for a couple of hours that day and showed up for a few days afterwards!

Definitely a male pipevine swallowtail - they're unmistakable.

Sherry

Plant you some pipevines & they will be in your yard all summer...that's what I did! One of my most favorite BFs!!! Great picture...I usually get a blurred picture because they flit their wings so fast!
Here is a picture I took just recently of a female...
{{gwi:538228}}
Take care,
Lila