Silk tunnels on exposed upper surfaces of rocks, but leading down to the ground. I have previously only ever seen these under rocks and pots etc in the garden. I got some very poor glimpses of a couple of individuals. The one shown in images 2, 3 and 4 appears to have wing buds, so would presumably be an immature male. The last image shows the rear end of one and what looks like a smaller, paler insect that might be an earlier stage?