Good information there Steel.
If I recall, I was stung by a spider once, and it was running off. All I can tell was that is was black, and the size of a b widow. So, if that is what I was stung by, it just got red on my hand and hurt like a bee sting.
Nice centipede by the way. Scissors are handy with them. Sharp ones of course. Or gasoline and a match.