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Sympetrum corruptum
Somewhere in the Lake Mead National Recreation Area.
Thanks for the correct ID and info John, I have corrected the page.
OK, well, as I said, no Libella fulva in the States. I did find this character in Dennis Paulson's book, Dragonflies and Damselflies of the West, though (don't you just love America-centric publications - forget the west of anywhere else).
It is S. corruptum. According to the eminent Dr. Paulson teh "yellow spots low on side of thorax" are diagnostic. These show clearly on your specimen.
Oh, and I thought this initially to be male based on the shape of the anal appendages but I now see there's no 2ary genitalia - this is a female.
OK, I need time to look through my newly delivered books on American dragonflies by Dennis Paulson [Dragonflies and Damselflies of the East/West]. However, a cursory glance shows that Scarce Chaser (A British Dragonfly Society name, incidentally - Libellula fulva), does not occur in the United States, so it ain't that. Not that it looks like one.
Time to search ...