Here are a couple of flies.
The first is with black and silver beads in pairs and a blue peacock hackle. Hook - Partridge YK12ST size 10.



The second -
Clyde Sand Fly

Hook: Partridge Captain Hamilton wet fly #14.
Body: Gray or black tying silk,
ribbed with blue silk.
Wings: Marled sandy part of hen Pheasant tail,tied flat along hook shank.
Hackle: Black Cockeral and fairly long in fibre. Conranch.

This is the Scottish imitation of the Gravel Bed (Hexatoma fuscipennis).
A member of the Diptera Order.
Like a small crane-fly.