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Four tarsomeres (first longest), palps present, and not "buff-coloured" with "head and dorsum of thorax pale brown" should make them Miastor metraloas.

Quoting Wyatt (1967): "Larvae are readily found under the bark of rotting birch, where they often occur in large numbers and form dense star-shaped clusters. The decaying wood of many other trees may also be colonised to a lesser extent. The white larvae feed on the mycelium of wood-rotting fungi and reproduce by paedogenesis throughout the year."