Neivamyrmex opacithorax
Rio Rico, Santa Cruz County, Arizona
Coordinates: 31.468064, -110.991869
Elevation: 3,420 ft
July 15, 2017
Size: 11 mm
Under a covered picnic table at the Guy Tobin Trailhead
Attracted to mercury vapor and ultraviolet lights
Determined by James C. Trager