Common Names: Twelve-spotted skimmer, ten-spot skimmer
It is a large species, at 50 mm long. Mature males have twelve brown wing spots, as well as eight white wing spots. The basal area of the hind wing is also whitish. Females and immature males have the twelve brown wing spots but not the white spots. Their abdomens are brown with a yellow stripe along each side.
Found near ponds and lakes; sometimes bogs or slow-moving streams in the summer.