I live in Cape Town and recently removed a section of floor boards which I replaced with tiles. While removing the boards I noticed small holes and suspected I had some type of wood destroying bug. After the wood was lying outside for a while (about 2 months) I eventually got around to sorting it, as I wanted to keep the pieces that were still intact. I found several of these bugs, ranging in size from about 8 to about 20 mm. Hope someone can tell me what they are, and how I can kill them if they are indeed pests.