I knew who I could ask about their identity - Laura Hughes, who I have mentioned many times before on this blog. She quickly came back with an answer; an answer you may not necessarily be pleased to hear.
While these brutish biters are not everyone's cup of tea, I've always liked horseflies, in part because of some species' wild op-art technicolor eyes.
HERE. And I'll take more bloody rasping bites for the team, I'm sure, in order to get ever better photos of the fantastic eyes of these amazing creatures.
Who, as it turns out, also have amazing eggs.