This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionBorophaga incrassata (15095187407).jpg
Small black fly found on 26 Aug 2014 on bushes near River Fynn at Martlesham, East Suffolk, TM252473. Identified using the keys to British Phoridae in RES Vol 10.6 Scuttle Flies (RHL Disney, 1983).
The photo shows a lateral view of the insect with an inset close-up of the face with the characteristically raised ocellar triangle and transversely elongated anterior ocellus. The face is about 1 mm across and the wing about 3.5 mm long.
ID confirmed by Dr Tony Irwin, see www.diptera.info/forum/viewthread.php?forum_id=5&thre.... The larvae of this species parasitize the larvae of Bibio marci. This genus has the alternative name of Peromitra, though Borophaga is preferred in the UK. In the RES Handbook on Scuttle Flies by R H L Disney this species is described as "Widespread in lowlands of England". Under-recorded on the NBN Gateway where there is currently only one record for East Suffolk, logged at Flatford Mill by R H L Disney himself on 19 August 1981.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue