The Society for the study of flies (Diptera)

For Sicus ferrugineus in the UK the habitat appears to be any sunlit and flower-rich site where there are lots of Apoidea, particularly Bombus.  Woodland rides, roadside verges, tall species-rich grassland, meadows, emergent wetland vegetation and flowering ivy all feature as capture sites for this species.  The known host range is quite wide.  Sicus abdominalis is of such rare occurrence that I cannot make any sensible guesses about its likely habitat preferences.

Leopoldius brevirostris is an uncommon species in the UK but shows a clear preference for woodland situations, usually flying in mid-summer.  Woodland rides, woodland edges and traps under canopy all feature as capture locations.  The host is unknown, but may be vespine.  This contrasts markedly with the commoner L signatus which overwhelmingly gets taken in late summer/autumn in sunlit situations with abundant vespid wasps, the main known host.  Flowering ivy (in almost any sunlit location) is the classic capture site.