Nederlandse waarnemingen van het genus Dichetophora (Sciomyzidae).

Abstract

The distribution of the two Dutch species in the genus Dichetophora (Sciomyzidae) is discussed. Both species seem to be restricted to neutral or calcareous soils; they are absent in real wet areas. D. obliterata is known with 250 specimens, especially from the dunes and South-Limburg, but also in the intermediary areas. The species is almost absent in the north-eastern parts of the Netherlands, including the acid dunes of the Frisian islands. D. finlandica is only known with 40 specimens, most of them from dune areas. Whereas the distribution of the two species is comparable, the flight periods indicate differences. D. obliterata is bivoltien with a low peak in June and an high peak in September; D. finlandica is univoltien with the peak in August.