The big abdomen was about maybe 10mm? Front part much smaller. & then the leg span, unsure. It was the only one I saw Was in weeds and ran fast away, as I was pulling weeds out at home. I thought it looked like a red back - but with white stripe instead of red stripe. Any ideas? Could it be a relative of redback / black widow? Or some poisonous? Or what could it be? I look forward to your response.