Taxon When I saw these on the North Fork of the Coeur d' Alene river I did my feeble research and found Nemoura winter stones. I have since then been calling them that. From what I see in your post that is probably wrong?
Do we have nemoura in WA are they more brown than black?
The winter stone imitation that I tie is a size 16 with coarse dubbing picked out (looks leggy) two wraps of #16 black hackle and a white wing laid flat over the body, I use that real thin foam packing/wrapping sheet for the wing. When the fly gets wet the only thing that floats is the wing. It works well.
Excellent question. The Forestflies of family Nemouridae are known as Spring Stoneflies and start emerging starting in March, whereas the Snowflies of family Capniidae are known as Slender Winter Stoneflies and their emergence begins in December. Please see Stonefly Taxonomic Structure. Flyfishers sometimes refer to Nemourids as Mottled Browns. However, some fit that description better than others. Here is a list of the Nemourids found in WA:
one thing that i do is when i am gathering insects is put take a few viles with me and when i get home preserve them in everclear. i have a golden stone from when i was 8 that looks like i got it yesterday.