Specimens examined range from central Alberta to New Brunswick and in the East as far south as the Ottawa River Valley, but the species presumably also occurs in appropriate habitats in northern New York and New England.

Reports of this species from north-eastern Ohio (Rings et al. 1992, as E. infumata) need to be verified.

Adults are on wing from late July to early September with most records after mid-August.. Larvae have been recorded on Betula papyrifera, Populus tremuloides and Populus balsamifera.

The specific epithet is derived from Faustus, or Faust, the alchemist of German legend who sold his soul to Mephistopheles, or Mephisto, in exchange for knowledge.

The ending is amended for a more euphonious combination with Enargia, and is a noun in apposition.