About 31 North American species are known in Argia. Larvae are relatively short and stocky and somewhat flattened (depressed) dorsoventrally. Head relatively longer than in other genera of Coenagrionidae.
Midwest: up to 5.1
Mid-Atlantic: up to 6
Engulfer / Predator
Widespread (east of the Rocky Mtns.)
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Order: Nymph with mask-like labium below chewing mouthparts. Wings developing in wing pads. Segmented legs present, each with two claws.
Family: Zygoptera (slender body shape with head wider than thorax and abdomen, and with 3 long feather-like gills at posterior end). Antennal segment 1 much shorter than rest of its antenna. Pair of lobes at distal end of labral mask each with 0–6 setae, but attached moveable hook without setae. Ligula (distal part of palm of mask) usually without median cleft, mask roughly triangular or square (not stalked as in Lestidae). Each side of median line with either 0, 1, or 3–5, dorsal premental setae (hairs inside the palm of the mask). Mature larvae 13–25 mm long.
Genus: Setae absent from dorsal palm of labium. Lobes at end of labium each with 2 distal hooks, both pointed. Caudal gills at least 2/3 as broad as long, sometimes thick and triangular in cross-section near base.