[White and Sulphur Butterflies East of the Cascade Mountains of Oregon and Washington]

The photo above shows the appearance of thelower wing surfaces of what possibly is a Becker's white as seen on a thistle (Cirsium sp.) in Zumwalt Prairie in northeastern Oregon.........July 10, 2007. Note the broad greenish-black markings following the venation of the ventral hind wing.

The photo above shows the appearance of the upper and lower wing surfaces of what possibly is a Becker's white as seen on a thistle (Cirsium sp.) in Zumwalt Prairie in northeastern Oregon........July 10, 2007.