Anthophora possibly with white face on penstemon - Anthophora bomboides
Rocky Mountain National Park, Larimer County, Colorado, USA July 24, 2013 Size: BL ~ 15.5 mm
This white-faced bee has 3-cell venation with a short marginal cell that suggests genus Anthophora. It was seen on blossoms of Penstemon virgatus and then dropped to the ground. Any help with its ID is much appreciated.