Norellisoma opacum
General description:
Similar in general appearance to N. lituratum, but the thorax and abdomen are densely grey dusted except for the shining black terminalia. Best distinguished by the male genitalia. Wing length: ♂ 3.7 - 4.1 - 4.6 mm (20); ♀ 3.8 - 4.3 - 4.6 mm (7).
Biology:
This seems to be a species found in long, damp grassland situations like N. lituratum, but nothing is known of its larval stages. Collin (1958)[1] states that it can be swept from "Spiraea" (note that this is an old name for meadow-sweet, but also the current name for an closely related introduced alien - I am not sure which Collin meant).
References
Distribution:
Widespread and not uncommon.
World distribution: Palaearctic: Netherlands.