Here are a couple of pictures of a beetle on standard graph paper (1mm squares). Several of them have appeared in our house, mostly in the kitchen, over the last week or so. They are dark brown in colour and one centimetre long. One landed on my face as I awoke this morning and then proceeded to fly away so they could have come from the garden. Are we being invaded by dangerous insects ? or should I ignore them and let them get on with their lives unhindered ?