Well, I got tagged in the field today at around 3:20pm CST. It was a small male and it nailed me good, right in the tip of my left thumb. I've always free-handled our native scorps by grabbing the last two or three segments and immobilizing the telson, and I've been tagged a couple times by some Vaejovis , which were essentially painless, and once by a C. sculpturatus which I thought hurt moderately. I've handled literally hundreds of C. vittatus in various states this way and had never been hit. In fact, I had actually considered letting one sting me just to see in the past...if you share a morbid curiousity like me, let me tell you now...DON'T DO IT.
On a scale from 1-10 pain, it was an instantaneous 6-7 and I was unable to stand still. Imagine someone sticking a thumb-tack, covered in lemon juice, into your thumb all the way. It stayed very strong for about 5 minutes and over the course of an hour, it had dulled to a 3 or 4. By two hours, it had dropped to a 1-2. As I type this (roughly 3 hours later), my thumb still feels a strange pins-and-needles effect...like it's asleep or being very faintly electrocuted. I can't see where the telson went in or anything and there's no swelling. When I lower my hand below my waist, the blood flows down and a throb of pain comes back, at around a 1.
Pretty impressive sting, the worst I've ever receieved from any invert, and certainly worse than any bee, wasp, or velvet ant I've been stung by.