Pemphredon sp of woodwasp (River Cam)

Nests in dead and decaying wood. The nest comprises a branched tunnel system, with each branch terminating in one to several cells , the cells are situated in rows and also observes the very occasional use of a shared entrance hole by two or more females although the subsequent nest tunnels were quite separate.

Prey collected
Mainly aphids (Hemiptera: Aphididae), with up to 40 per cell

One of the Pemphredon sp of woodwasp there are 9 in this genus.

The wasp on my hand I saved form a spider web.