Saw it in forest area of the park, fluttering near the ground and low growing plants. When it flew it looked like a whirling white circle. This attracted me to it. Was able to get a picture with my phone - not of greatest quality but I think helpful to verifying identification.
I'm not sure of this ID: the bands seem too white, and the pattern doesn't look quite right. It's also slightly out of range, according to the map in Kaufman's butterfly book.