Explanation of Names
Years ago many children refered to this as the "Six-spot", and counted the basal spots as two crossing the thorax, instead of four separate spots. The same went for the then "Ten-spot", which most recent books have switched to calling the "Twelve-spotted Skimmer". The "Six-spot" name doesn't seem to appear in any books, but was likely rationalized from comparison with the "Ten-spot" that was to be found in many books. Back then, Libellula forensis didn't seem to have an established published common name yet.
West of Canadian & U.S. Rockies.