A common North American skimmer dragonfly, the Twelve-spotted Skimmer, Libellula pulchella, is found in southern Canada and all mainland USA states.
Each wing contains 3 dark spots, begining on the outside of the wing. The top wing has two white spots on each side and the bottom wing has three white spots on each side. The third spot on the lower wing is located below the dark spot along the dragonflies body.

This individual is a male of the species distinguished by the presence of the white dotes on the wings which are absent from the female.
Sandbanks Provincial Park, Ontario, Canada