Many observations have been made on the nesting behaviour of this species (Hamm & Richards, 1930; Boreham, 1956a; Peckham, Kurczewski & Peckham, 1973; Peckham & Hook, 1980). The following observations were made by J P Field at a small sandpit on the edge of Sunningdale Golf Course, Surrey. The wasp burrows in flat or sloping (not vertical), bare, sandy soil. The oblique burrows are 2-12 cm long and take about two hours to dig. At the end of digging, the female quickly closes her nest by scraping sand into the entrance, and begins hunting. Prey is captured in mid-air and on vegetation, and stung once in the thorax behind a front leg base (Steiner, 1979). Females fly to a spot near the nest with the prey carried under the body; then the prey is impaled on the sting for the last metre or two (very unusual in solitary wasps). Nest provisioning is described and illustrated by Olberg (1959). Each cell is provisioned with 2-16 paralysed flies, the number depending partly on their size. Provisioning a cell takes about 90 minutes. After taking the last fly in, the female arranges the flies in the cell, oviposits on them, then digs the next cell. There are usually two or three cells in a nest. The most successful females can provision 34 cells in a day.