Eastern Amberwing
Albert corrected me as to the identification. I had labeled it as Perithemis domitia, the slough amberwing. He correctly identified it as Perithemis tenera, the eastern amberwing. That makes more sense, base on where I took the picture and the range of the two species. Also, the differences in markings, although not glaring, are certainly enough to be definitive. Thanks, Albert.