Male Halloween Pennants have red-topped abdomens. Females can be reddish or yellow. When perched, this pennant holds its forewings higher than the back ones, a trait evident in the photo below.
This species is found from Central America, across eastern North America, often to southern Canada. Although they can be found away from water, they prefer lakes and ponds. This dragonfly is a hardy species, even encountered on cool, windy, rainy days (Mead).