This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
Described by Kirchner, R.F. & Kondratieff, B.C. (1997) A new species of Nearctic Perlesta (Plecoptera: Perlidae) from Virginia. Proceedings of the Entomological Society of Washington 99, 290–293.