This is Euphydryas editha augustina from the Bluff Lake meadow area near Big Bear, June 17th, 2012.
These Euphydryas editha augustina can be locally common around Big Bear. These were along the PCT east of Van Dusen Road, Big Bear, May 6, 2006.
Another 'August' Edith's Checkerspot from the same hike.
Ventral of Euphydryas editha augustina, same hike. The endangered Quino Checkerspot is a different subspecies of editha, thus a close relative.
This is a post-diapause larva of Euphydryas editha augustina. I found several feeding and taking shelter at the base of Castilleja applegatei at the trailhead of the Sugarloaf Trail in Big Bear. This photo is from April 24, 2022.