The blue dasher is a dragonfly of the skimmer family. It is common and widely distributed in the United States and Canada.
Mature males develop a bluish-white pruinescence on the back of the abdomen and, in western individuals, on the thorax. They display this pruinescence to other males as a threat while defending territories at the edge of the water.
Although the species name ''longipennis'' means "long wings", the wings are not substantially longer than those of related species... more