Wall Mason Wasp - Ancistrocerus parietum


Females vary from 10 to 13mm, males are slightly smaller and reach a bodily length of 8 to 11mm. Ancistrocerus parietum, A. gazella and A. quadratus are all very similar and hard to separate without detailed examination. The basic colour is black, with yellow bands, and they have a very narrow waist.

Identification difficulty

Usually seen visiting nesting holes, sometimes there a numerous holes in a suitable bank or wall.

When to see it

May to September peaking around July.

Life History

Nests in any suitable cavity, from small holes in old walls, to holes in tree trunks or soil banks. The prey of this genus is lepidopterous caterpillars.

UK Status

Fairly common and found in England, Wales, south Scotland and Ireland.

VC55 Status

Fairly common in Leicestershire and Rutland.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map