We're fortunate in southwestern Ontario to have such a diversity of Odonates, the order of insects that includes dragonflies and damselflies. Gram for gram, they are some of the world's most efficient predators as they track down and intercept their prey in midair. Their excellent vision and impressive aerial gymnastics make for a deadly combination. 

A male blue dasher (Pachydiplax longipennis) perched on a stalk of Viper's Bugloss. Dragonflies are considerable larger and much stockier than damselflies.

Skimming Bluet Damselflies (Enellagma geminatum) Mating on a Lily Pad. Male is on the left.

Familiar Bluets mating. The red circular objects are parasitic mites attached to the abdomens of both damselflies.