[1] They can be found on windows, foraging for nectar on flowers, or searching out small cracks or holes in which to nest.

[1] This wasp is native to Europe, its range including Norway, Sweden, the Netherlands, France, Spain, Germany, Italy, Poland, Austria, Ukraine, Romania and Bulgaria.

In the British Isles it occurs in England, as far north as Stockton-on-Tees, in Wales and at scattered locations in Ireland.

[1] In late spring, the wasps emerge from their over-wintering sites and feed on nectar and pollen from such plants as sea-holly, bramble, hogweed and thistles.

After a short rest, or an extended period of diapause, depending on the time of year, the larva spins a cocoon and the adult emerges about a fortnight later.