I've documented another dragonfly visiting our pond. It was a Black Saddlebags, Tramea lacerata. My phone's camera couldn't capture a picture of this fast-flying critter, but I was able to send myself an e-mail documenting the find. Here's the e-mail:
"Saw a saddlebags by pond
August 22, 2012
This brings our total number of dragonflies and damselflies to six species! Check out this recent post to see the the other five.
Black Saddlebags perching
Photo courtesy of JerryFriedman