Anax longipes

I had this originally as a Common Green Darner and only realized the error when I received the June 2008 issue of Argia, which has a Comet Darner pictured on its cover.
This and that are clearly the same species of insect.

"This distinct darner has the typical green thorax of the genus, but the top of the frons is unmarked, unlike that of other green darners. The legs are unusually long, and the femora are red, except distally where they become black ... The male abdomen is brick red beyond the basal green segments."