Relatively harmless compared to what? One of your famous snakes? LOL
We have a lot of slightly venomous ones, too. I got bit by one a few days ago while I was splitting firewood, I smashed it so thoroughly that I didn't get a good ID and it left a hell of a welt and felt like a burn for a couple days. I thought the chart was funny because to the author, all spiders are bastards, an opinion shared by many that are spider-averse.