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I have been finding these small beetles ,approx 3mm in length , in my house recently .Finally I have tracked them down to a large tub of dried mealworms ,purchased from Amazon a few weeks ago .As most of the dried mealworms seem to originate from China , I wondered if this is an invasive beetle or it got into the batch at the UK distribution centre .I have looked at several European Coleoptera websites ,but still haven't found the ID , can anyone help ,please?