Nogales, Santa Cruz County, Arizona
Coordinates: 31.335269, -110.938018
June 24, 2017
Size: 18.5 mm (to tip abdomen)
Dozens of these wasps were actively flying around and over the canopy of a Chilean Mesquite tree. They appeared to be a lek.
Determined by Bob Biagi
FAMILY SPHECIDAE (Thread-waisted Wasps)