I saw several of these at Swan Harbor Farms in MD on August 4th, 2012.

This Spicebush Swallowtail was at Kenilworth Aquatic Gardens in Washington, DC, on August 18th, 2012.

I saw this one at Bombay Hook NWR on July 16th, 2013.

These were along the WB&A trail near Washington DC on July 29th, 2013.

I saw this one at Swan Harbor on August 16th, 2013.

There were several at Swan Harbor on August 6th, 2014.

This Spicebush Swallowtail was at Longwood Gardens, PA on August 9th, 2014.