Sexing wasps in the genus Ammophila (clypeus outline) - Ammophila -
Tonopah Desert, Maricopa County, Arizona, USA May 4, 2015 Size: 20mm
NOTE: Here is the link to the DiscoverLife.org website information for A. aberti, including the shape of the male's clypeus: (drawings) DiscoverLife.org - Ammophila aberti