Mimesa celtica SPOONER 1948; Psen fulvitaris GOSSAKOVSKIJ 1934; Psen fulvitaris GOSSAKOVSKIJ 1934 preocc.; Mimumesa unicolor misident.
This species is morphologically very similar to M. unicolor. Recent appraisals of the differences between these two species can be found in Else & Felton (1994) and a rigorous statistical examination in Budrys (2001). The species has been ascribed to the genus Psen in most previous literature, including Shirt (1987) and Falk (1991).
Traditionally, this species was thought to be restricted to coastal dunes in western Britain and eastern Ireland, e.g. Braunton Burrows in Devon, Oxwich Dunes, Glamorgan, Ainsdale in Lancashire and a confirmed record for Ireland from North Bull Island in Dublin Bay. However, during the 1980s G R Else collected a series of specimens from the Charmouth-Lyme Regis landslip.
Widely distributed in the Palaearctic region: generally scarce in Fennoscandia; also recorded from the Netherlands and Germany. In Asia it has been recorded from Mongolia, Manchuria (N.E. China) and Japan (Lomholdt 1984).