Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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 Stark, B.P. & Baumann, R.W. (2004) The winter stonefly genus Paracapnia (Plecoptera: Capniidae). Monographs of the Western North American Naturalist 2, 96–108.