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 Kondratieff, B.C. & Baumann, R.W. (1999) Studies on stoneflies of North Dakota with the description of a new Perlesta species (Plecoptera: Perlidae). Proceedings of the Entomological Society of Washington 101, 325–331.