Help ID this Butterfly

Photographed in Nashville, Tennessee on May 29, 2003 at about 11:35 PM

The closest we could come in our basic field guide was a Great Spangled 
Fritillary. Is this correct (were we even close)?

See photo here:

http://home.comcast.net/~jnrigg/IDThis01.htm

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   -== JNR ==-

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