Advertisement I have a few B jacksonis for a while, starting with 5, but 2 died mysteriously along the way. I'm not sure which instar they are. They recently molted. One of them is showing the male traits, bulbous pedipalps. Is that the sign of maturity? He's around 2 inches measured from head to tail (not stretched, I'm not gonna make him do that). Is it safe at this point to put them together? I have them in separate containers. Another question too is how to determine the size. Some literature said males are 2-3 inches, and females are 3-4 inches. How is that measured (head to stretched tail, etc)?