Parhelophilus frutetorum (Fabricius, 1775)

Identification

Identification difficulty = 3. according to Ball & Morris, 2024¹

Synonymy

Helophilus frutetorum Fabricius in Coe(1953)².

Biology

The larva and puparium have been found in organic rich mud at the edge of a woodland pond. Adults are usually found around pools in fen and wet woodland. They are normally found in lush vegetation near standing water, but both sexes will visit nearby tree flowers and settle on sun-lit tree foliage. Visits a wide range of flowers, especially white umbels and yellow composites.

Flight period

The following plots show the number of unique records per week that were not reported to be of eggs, larvae or pupae.

Distribution

Locally abundant in suitable habitat in England south of a line between the Humber and the Ribble. Mainly an eastern species with scattered records from south-west England, south Wales and the Midlands. It is scarce in the more northerly parts of its range and is known from one modern locality in northern Cumbria and one from the central belt of Scotland, both areas where P. versicolor is reported. It is therefore possible these records are erroneous.

Trends

The following plots show the Frescalo TFactor vs year and a map of the rescaled frequency (all records) for the species. For an explanation see here.