The nests are constructed in sandy soil, not infrequently in aggregations. Some nests have been found under paving slabs (usually laid on sand) (Shaw & Pont, 1971). The soil accumulated from digging the burrow is not dispersed by ritualised, instinctive behaviour on the part of the wasp, but is left to form a tumulus (G W Allen, pers. obs.). The burrow goes down 30-40 cm almost vertically and there may be one or several cells. Each cell is provisioned with four to thirteen flies, the egg being laid on the first of these (Lomholdt, 1975-76). Nests are frequently established in shady locations, an unusual habit for an aculeate (M Edwards, pers. comm.).