One of my fears is of insects. Don't ask me why I am so threatened by something that is 1/10000 of my size. We have been having these little guys running around the house. My husband has informed me that his research indicated not to fear these spiders. This is because it is highly unlikely that they would bite humans but if they do they have bites equivalent to a yellow jacket sting. From what I recall being stung hurts like the dickens! This actually just adds to my severe hatred and fear of this minuscule creature. Here is the information on the Callobius Severus.