I found a brown and black spider with striped legs and what looks like an black arrow on it's back in the hallway of my house. It's an old house that we are still fixing up so it tends to have quite a bit of little spiders but this thing spaned probably as big as my palm with all the legs outstretched. I live in Southern Virginia, about 3 miles from the NC stateline in Danville, VA. I really want to know if it is poisonous because I have my nieces staying over. I'd also like to know if I should be concerned about more. I tried to get it but it ran in my husbands office and I lost it so now I'm concerned. Please help!