Rainieria calceata (Fallén, 1820)

Identification: Legs: All femorae black at base.

Images: There are many images of this species on various sites. The Flickr site of Nikola Rahmé features a video and shows details of the pronounced proboscis, Steve Falk's Flickr has a collection, both detail the habitat.

A blog by Matthew (in Polish) is of interest for his behavioural observations, there are also many images on the Russian MacroID site and some on Diptera.info

Distribution

Europe: Countries (published), online at Fauna Europaea, Occurrences, points on abiotic (Sumner, 2018) and at GBIF
UK: Recording Scheme map of occurrences 2016 , 2018 (verified.) Online (NBN Atlas) via Easy maps or Interactive Atlas
France: Example of different methods of depicting distribution in France. occurrences predominantly from Phil Withers. One of Phil's records is a matter of a few kilometers away from the Spanish border - a challenge for Spanish photographers to obtain a country first.