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Published online by Cambridge University Press: 31 May 2012
The nymph of Coenagrion interrogatum (Hagen) is described for the first time and the nymph of C. resolutum (Hagen) is redescribed. A species key to the nymphs of Coenagrion in Alberta is presented along with characters to separate Coenagrion nymphs from Enallagma nymphs.