Cheilosia nebulosa (Verrall, 1871)
Biology & ecology:
The larva of this species is unknown. Adults visit flowers such as Salix catkins along woodland rides and edges, often near carr or marshes. Males hover high up beside flowering sallows Salix sp. or Hawthorn Crataegus sp. bushes.
Very widely distributed but records are extremely scattered. Numbers drop towards the Scottish borders and there are just two records immediately north of Edinburgh.
Status & conservation:
The frequency of occurrence is very variable, and there is some evidence of a decline followed by a recent upturn. Recorded from 62 hectads since 1985.