Update July 27, 2011: Added a recent individual that shows the upperside in flight - at the bottom of the page:
This Boisduval's Yellow Eurema boisduvaliana near the end of the Ebony Trail at Resaca de le Palma State Park, Cameron county, Texas on November 4, 2009:
Update July 27, 2011: this individual was fluttering around on the edge of the woods at Sabal Palm Sanctuary, Cameron county, Texas on June 26, 2011: