Unknown Beetle or Fly

Unknown Beetle or Fly

Observation - Unknown Beetle or Fly - UK and Ireland. Description: Dark with longish antennae, wings fold onto body, a single white spot on its back and a single stripe on its bum (sorry can't think of a more precise way to describe where the stripe is).

Dark with longish antennae, wings fold onto body, a single white spot on its back and a single stripe on its bum (sorry can't think of a more precise way to describe where the stripe is).