Common Blue Damselfly - Enallagma cyathigerum

A medium-small damselfly. It can be distinguished from other blue damselflies by the thick blue stripe on its thorax. The other common and similar damselfly, the Azure, has a much thinner stripe. With a little practice, it is relatively easy to pick out this difference in the field. Mature females have three colour forms: 'blue', 'brown' (which is often yellowish-orange) and typical (greenish). The males are a drab pink/purple when just emerged, taking a few days to become blue. However they can be distinguished from females by having solid blue on the bottom 2 abdominal segments.