The Compton's Tortoise-Shell - a species first reported in central Alaska in 2002. It has survived here since by overwintering (as adults) in warm areas such as outbuildings.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/48874808@N00">D. Sikes</a> from Fairbanks, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/alaskaent/273243678/">2006-09-18-0410a-Nymphalis vaualbum.jpg</a>