A small black spider wasp. Males lack the ivory markings on the face and hind legs present in its congener Agenioideus cinctellus (Spinola), and females may be separated by the presence of a fore tarsal comb and by differences in dentition.
Until recently this species was thought to be confined to the Channel Islands within the British Isles. However, in 2005 it turned up in a garden in Midhurst, West Sussex, where it is apparently resident. Further examples were also taken at Folkestone, East Kent in 2006; University of East London, South Essex in 2009; Cliffe, West Kent in 2016; and Pegwell Bay, East Kent in 2017, so it would appear that the species is becoming established in south-east England.
Overseas it occurs in central and southern Europe (Wolf, 1972).