Mystery Butterfly Possibly Identified!

I think I may have identified one of the mystery Butterflies in the post below.  I’m referring to the Butterfly that I said resembled a Swallowtail but didn’t have the “tails” of a Swallowtail.

I don’t want to give away what type of Butterfly I think this may be quite yet because I’m interested in the feedback from others (leave your comments and/or guesses!).  However, I’ll give some hints.  This species of Swallowtail doesn’t have the “prominent tails” of a Swallowtail, and this species typically only occurs from South Texas to Argentina (source: Butterflies of Houston and Southeast Texas).  Last but not least, according to the book I mentioned in the previous sentence, this Butterfly is “extremely rare in our area and should never be expected.”

So let me know what type of “Swallowtail” you think this is.  I’ve included another picture of this “Mystery Butterfly.”

Rare Houston Butterfly