Length about 8 mm. A blackish, slender bodied wasp.
Various habitats, often in well vegetated areas.
When to see it
Summer and autumn.
Nests are located in hollow plant stems such as bramble, reeds etc., and are provisioned with dead spiders. This species will attempt to enter and usurp the nest of other aculeates of all species.
Fairly widespread in Britain, but more frequent in the southern parts.