Appearance
The northern bluet is a small damselfly with a length of 1 to 1.6 inches long. The male is predominately blue on the sides of its thorax, and the upper side of its abdomen. Its lower abdominal appendages are longer than its upper appendages. The female's body is greenish-yellow to brown color. The upper side of its abdomen is mostly black.
Naming
Like many bluets in the genus Enallagma many species look similar to each other. The northern bluet looks has similar to many bluet species. They include the boreal bluet, familiar bluet, Hagen's bluet, marsh bluet, and vernal bluet. It can be distinguished from familiar bluet by the large postocular spots and the shorter cerci. The characteristics shared by northern and boreal bluets are their large eyespots, and a mushroom-shaped black spot on abdominal segment S2. Its best seen dorsally.References:
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