Twelve-spotted Skimmer

The twelve-spotted skimmer (Libellula pulchella) is a common North American skimmer dragonfly, found in southern Canada and in all 48 of the contiguous U.S. states. It is a large species, at 50 mm (2.0 in) long. Each wing has three brown spots. In adult males, additional white spots form between the brown ones and at the bases of the hindwings; it is sometimes called the ten-spot skimmer for the number of these white spots.

References

Dunkle, Sidney W. (2000). Dragonflies through Binoculars. New York: Oxford University Press. pp. 173–174. ISBN 0-19-511268-7. Needham, James G.; Minter J. Westfall Jr.; Michael L. May (2000). Dragonflies of North America (rev. ed.). Gainesville, FL: Scientific Publishers. pp. 719–720. ISBN 0-945417-94-2. Mead, Kurt (2009). Dragonflies of the North Woods (Second ed.). Duluth, MN: Kollath+Stensaas Publishing. pp. 134–135. ISBN 978-0-9792006-5-6.