I live in Cornwall and there are tiny beetles in my bedroom. When they're young they are translucent and so small they're almost impossible to see unless they're moving. They grow to be about a millimetre-and-a-half and can move impressively fast in short bursts. It's incredibly difficult to get a picture as merely brushing them with a finger will kill them. I can't tell for sure but they seem to be attracted to dust, paper and clothes.
While investigating a discarded sheet that had a high concentration of the critters, I straightened out a fold and found several small white worms with brown heads - like a cross between a maggot and a caterpillar surrounded by clusters of what I assume is fecal matter. The sheet doesn't appear to be damaged so I don't know what they're eating.
I have no idea what they are but considering the large numbers in close proximity, I'm wondering if the beetles pupate into the worms or whether I have two different sets of bugs.
I've seen the beetles in a friend's house and I suspect they came to me in a book I let him borrow not too long ago. I haven't found any clues on the internet by myself despite a lot of searching so I thought I'd ask here.
OK, the worms appear to be clothes moth larvae, meaning that they and the beetles aren't related (I thought it was weird when I suggested the possibility, I mean, who's ever heard of a beetle turning into a worm instead of the other way around?). Though the beetles, considering their concentration near the larvae could be feeding on the pupae or their poop.
I guess the larvae are the bigger problem but the beetles are more of a mystery and I love a good mystery. They're not silverfish. They have no feelers, just a tiny head and a sort of comma-shaped body - like a slim flea. If I could get a good picture, I'd take one.
EDIT: I managed to get one with an intact head and held it up to a light. It had a pair of very fine antennae.