A tropical interloper

Last night I notice a small beetle crawling on the inside pane of the kitchen window. I potted it and had a quick look under the microscope. It was about 3mm long and had a couple of abdominal segments exposed beyond the elytra.

It was as I had first assumed one of the Nitidulidae or pollen beetles and it keyed easily to Carpophilus marginellus, another new beetle for me. It's not one I can find much info on and it's not covered in the RES Pollen Beetles book by Kirk-Spriggs. All I can find is that it was introduced from tropical areas to Europe and is pretty reliant on humans and their stored products.

So I'd better go and check the biscuit tin!