I saw several of these butterflies at Swan Harbor Farm in Harford County, MD on July 24th, 2010.

This intermediate female was in Susquehanna State Park in August 2001.

I saw this butterfly at Swan Harbor on August 21st, 2010.

This dark female Tiger Swallowtail was at Swan Harbor on July 15th, 2012.

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

This yellow female was at the National Arboretum in Washington, DC, on August 18th, 2012.

I saw this one near the trail to Turkey Point in Cecil County, MD on September 9th, 2012.

This dark female was in the same place on August 31st, 2012.

I saw these at Kenilworth Aquatic Gardens in Washington, DC on July 29th, 2013.

And these were at the National Arboretum later that morning.

I saw this one at Harford Glen on July 6th, 2014.

These were at Swan Harbor on August 3rd, 2014.

I saw many male and female Tiger Swallowtails at Longwood Gardens, PA on August 9th, 2014.

These were at Perryman Park on July 19th, 2015.