Abstract
An illustrated key to the males of the northwestern Nearctic species of Paraleptophlebia Lestage is presented together with a short account of the taxonomy and the ecology of the species. Paraleptophlebia aquilina n.sp. is described and illustrated. Paraleptophlebia sculleni Traver is reinstated as a valid species and how it differs from P. gregalis (Eaton), with which it had been synonymized, is described. The status of P. memorialis (Eaton) and that of P. temporalis (McDunnough) are redefined.

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