THE ADULT OF DRUNELLA ALLEGHENIENSIS (EPHEMEROPTERA: EPHEMERELLIDAE) WITH BIOLOGICAL NOTES

The adult stage of Drunella allegheniensis (Traver) is described for the first time. Characters separating it from the closely related D . tuberculata (Morgan) are summarized, and the existing taxonomic key to the group is modified to include D . allegheniensis . Other species of Ephemeroptera associated with D . allegheniensis are reported along with observations on its biology.