Euchloe lotta, the 'Desert' Pearly Marble, nectaring on Fiddleneck near Cottonwood Spring in Joshua Tree National Park on March 30, 2009.

Dorsal view of Euchloe lotta, the 'Desert' Pearly Marble, same day as above.

Another lotta, same day. They were common in a certain wash large wash that had plenty of host plant and nectar sources along the canyon walls.