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The only North American species in this genus with is a fairly large
darner. The Riffle Darner resembles the genus Aeshna. It has brown coloration with two lateral thoracic
stripes that are blue above and yellow below. The mature male abdomen
is stout at the base with small blue spots on the anterior segments and yellow spots on
the posterior segments. Segment 9 has a pointed projection on top. The wings are broad in shape and clear. The females can come in three
forms, the Blue Form female has blue abdominal spots. Males and
Blue Form females have deep-blue eyes. Green Form and Yellow Form
females have brownish-yellow eyes. Females also present with a
shorter and shouter abdomen than their male counterparts. |