Raymondionymidae
1sp. Ferreria marqueti, (Aube, 1863).

The single British species of this mainly mediterranean family seems to be widespread around London but is thought to be rare and very local (Morris, 2002). First found in Kew Gardens (Williams, 1968) and considered to have been introduced with imported plant material or established at that site. It has subsequently been found in numbers from a few sites in Surrey, Kent and Middx and is now known to be an established breeding species (Thomson, 1995). Seems to be associated with, but not exclusively, the roots of ornamental conifers, these insect live underground and often deeply so. Their detection is difficult and the use of deep sampling pitfall traps (Owen,1995) is probably essential. Having said that the first specimens were found among excavated tree roots and, being no great fan of ornamental conifers, the thought of excavating a few and sieving soil from around the roots is attractive. Why not?

1.9-3.1mm. Brown and deeply punctate with broad and flat tibiae. Immediately recognised by the complete lack of eyes.

References
Thompson, R.T. 1995 Raymondionymidae confirmed as British. Ent.Mon.Mag 131:61-64
Owen, J.A. 1995 A pitfall trap for sampling hypogean arthropod fauna. Ent.Rec.J.Var. 107:225-228.
Williams, S.A. 1968. Raymondionymus marqueti typical form in Surrey. Ent.Mon.Mag. 104:112