Alder Fly (Sialis)

Alder Fly (Sialis)

Observation - Alder Fly (Sialis). Description: A rather wet fly on a concrete path. Probably an Alder Fly ... but which one? Edit: Changed to match Ian's ID. Many thanks.

A rather wet fly on a concrete path. Probably an Alder Fly ... but which one?
Edit: Changed to match Ian's ID. Many thanks.