Thoas Swallowtail in KY?

[C.G. Anderson]

I just saw what was clearly a Thoas Swallowtail on my butterfly bush.  I
had never before witnessed a butterfly such as this.  I did a search on
the Net for a picture, and it was a perfect match for the Thoas.  I
quickly learned, however, this butterfly (according to the USGS site)
should be nowehere near my home in Western Kentucky.  Is this true, and
is this an unusual visitor to these parts?  Any information on this
butterlfy would be greatly appreciated.
--
Chris Anderson
Eddyville, KY
 
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