This is a "Johnson Jumper" Spider... it isn't venomous but if you disturb or scare it, it can give you a bite. They are all over our farm and they are about 1-1 and 1/2 inches in length and about 1/2 inch wide. They are rather beautiful and jump very quickly when disturbed. I relocated this little guy who was on a leaf among my wax beans when I was picking them.