A rather variable species across its range, being given various infraspecific names; the British form has been referred to as subspecies proximus (Shuckard) (Richards 1980) or propinquus (Shuckard) (Lomholdt 1975-76).

A small, ground-nesting red and black solitary wasp. Identification keys are given in Yeo & Corbet (1995) and Richards (1980) (both as Psen equestris) and Lomholt (1984).

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).

This species is morphologically very similar to M. littoralis. Recent appraisals of the differences between the two can be found in Else & Felton (1994) and a rigorous statistical examination in Budrys (2001). This species was only formally added to the British list by Else & Felton in 1994, although the species was first taken by O W Richards in 1950, but mis-identified as M. spooneri. This species is listed in older literature under… Read more

A large, black and yellow, ground nesting solitary wasp. A key can be found in Lomholdt (1984). (Richards (1980) mentions the genus in his introduction but does not provide a key to the species.)

Previously known as Omalus truncatus. Identification keys and general biology are given in Spooner (1954), Morgan (1984), Falk (1991) and Kunz (1994).

Previously known as Omalus violaceus. Identification keys and general biology are given in Spooner (1954), Morgan (1984), Falk (1991) and Kunz (1994).

Previously known as Spinolia neglecta. Identification keys and general biology are given in Chapman (1869, 1871), Morgan (1984) and Kunz (1994).

An all-black species with bifasciate wings. It most resembles Dipogon bifasciatus from which it may be told in the female by the shorter antenna; the third segment being about equal in length to the scape and subequal to the fourth. The male has crenulate antennae and a subgenital plate with short hairs medially.