Thanks, needawin. I repeat, it is a wood wasp. The insect is also known as the horntail. It is a sawfly, and has nothing to do with the wasp or the wasp family, or bees, come to that. What wasp has a long "stinger", such that you'd notice it from a distance?. The horntail has no sting at all but is about twice the size of the ordinary, and real, wasp and bears a resemblance to a wasp. The horntail name comes from it's pointed abdomen, the 'wasp' one from it looking like a wasp. Goodness knows how many get swatted by people who think it is a hornet (a placid beast itself, you do well, or badly, if you can contrive to get one to sting you) or a wasp. It is probably out looking for a nice tree when it wanders into a house !