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Spicebush Swallowtail
Spicebush Swallowtail Caterpillar

Photos:
Above and lower left © Kim Hosen; Suburban back yard in Prince William County, July 2006

Lower left (caterpillar) © Judy Gallagher; Meadowood Farm SRMA, Mason Neck, Virginia; September 2014

Spicebush Swallowtail
Papilio troilus