Taken on 28th December 2008, Lincoln UK. Body length of this approx. 8mm. It most likely came inside with one of my plant pots, this one can run very fast!
The end part of the body or abdomen (pleon) is sharply marked off from the rest of the body (pereion). It's never more than 11mm long.
When running it's body went quite flat.
The end part of the antennae has 3 sections.