Comment. Field identification of the matrix Darners is difficult. To make matters worse, the males are usually in constant flight. Pay particular attention to the diagonal thorax stripes and the appendages tip. Kerst and Gordon (2011) provide an excellent identification guide that covers both males and femails.
Paddle-tailed. Glacier View, Mt Hood, Oregon
Paddle-tailed. Smith and Bybee Lakes, Multnomah Co, Oregon
Thorax markings of male Canada Darner (A. canadensis). Note indentation on leading edge of first stripe. Near Timothy Lake, Mt Hood, Oregon
Female. Mt Pisgah Park, Lane Co., Oregon
Mating wheel. Spinner Lake near Boulder Lake, Mt Hood, Oregon