The Slough Amberwing, Perithemis domitia, in Arizona has a limited distribution along the Mexican border in the Southeast corner of the state. On 18 September 2010 a male was found at Kelvin Bridge (Pinal Co.) near the Gila River, thus providing a new county record for the state. This also appears to be the northernmost observation to date of the species anywhere in Arizona. Thanks to Rich Bailowitz, Doug Danforth, and Dennis Paulson for comments on the subject.