Anthocharis cethura pima
Pima Desert Orangetip
This is basically an Arizona butterfly, but it is resident in the eastern reaches of southern California near the border. Yellow pima orangetips fly March-April and love to hilltop.
I came upon this Pima orangetip while hiking Sabino Canyon, which is on the outskirts of Tucson, Arizona. March 26, 2013.
Another shot showing the ventral side. These are easier to find in Arizona.
©Dennis Walker