What are these bloody flies?

Rich25
Rich25 Posts: 231
edited August 2009 in MTB general
Ive been doing a fair bit of fell/moorland riding this summer and im sick to death of these flies with red marks. I cant find anything about them on the internet but would just like to know if they are harmless. Was out today and it almost ruined my ride, there were freaking milllions!

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