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Ocypus ophthalmicus
An earwig-like bug I found running across my floor, about 2-3cm long. It was pretty fast moving and when I was trying to get it on to a tissue to put it outside it kept rearing up its back end almost defensively, a bit like the way a scorpion does.
It is a long-bodied black beetle. At about 20–32 millimetres (0.8–1.3 in), it is one of the larger British beetles. Its wing covers (elytra) are short, covering only its thorax, exposing the abdominal segments. The abdominal musculature is powerful and the abdominal segments are covered with sclerotized plates. It is capable of flight, but its wings are rarely used. It is covered with fine, black hairs. It is well known for its habit of raising its long and uncovered abdomen and opening its jaws, rather like a scorpion when threatened. Although it has no sting, it can give a painful bite with its strong, pincer-like jaws. It also emits a foul-smelling odour, as a defensive secretion, from a pair of white glands at the end of its abdomen.