Mating Imperial Moths

Weird bug
Location: 40° 54’ N/ 90° 17’ W
July 10, 2011 3:23 pm
I was wondering if you knew what kind of bug this is.. I live in central Illinois and It’s summer time. This bug was on my staircase outside and I have never seen anything like it.
Signature: Sincerely, Curious

Mating Imperial Moths

Dear Curious,
These are mating Imperial Moths.  The male on the bottom is the smaller, more purple member of the pair.

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Location: Illinois