An Anise Swallowtail! Those are very similar looking to Tiger Swallowtails and Two-Tailed Swallowtails. Love them though, they're big and beautiful. Nice picture! You can really see the colored details of the wings.
Would you mind if I used this as a reference for a drawing? I will give full credit and supply a link to the original. Please let me know, I think this photo is beautiful and I would love to attempt a recreation of it.
This is the most common kind of butterfly where I live - to see one up close in such detail only makes me appreciate them more! Absolutely amazing. Beautiful shot of a beautiful butterfly - you've been featured!