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Papilio multicaudata
Austin, Texas. Along Barton Creek in the greenbelt just south of Barton Springs.
Wow! Did not notice the two tails until you pointed that out, Keith. Added a second, pretty blurry zoomed pic where you can see the extra tail on the left side. Thank to all three of you for helping me look closely at the variation among these species!
Just to complicate things, I'm nominating Two-tailed Swallowtail. It's in range. It's appearance better matches Two-tailed than Eastern or Western and it looks like it has a second tail on the left hind wing.