Large, swift-flying dragonflies, usually marked with blue, green or yellow. Adults hunt tirelessly for insects over ponds, lakes and streams, and wander widely in search of prey. Most species rest in a vertical position, but a few sit flat on the ground. Females have a prominent ovipositor and lay eggs in water plants or floating wood above or below the water line. Larvae are slender and sleek, with flat labia lacking bristles; they are rapacious hunters among water plants. Recently, A. californica and A. multicolor have been transferred from Aeshna to Rhionaeschna.
Uncommon in southern valleys in B.C. More common at higher elevations and northward, it is the most common darner in the Yukon. Lives in a variety of habitats, mainly containing acidic waters, but it is most abundant in peatlands dominated by extensive stands of sedges.