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 one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
Patriot on Sep 18, 2017September 18th, 2017, 3:30 pm EDT
There was a great ariticle in the Autumn 2017 Fly Tyer magazine on the use of these beads by Hans van Klinken (the Klinkhammer guy). Anyway, these beads were about $7 on Amazon, but I accidently found the same bead package for approximately $2.
If interested, here is the link to the bead store: