From a Wired Science article titled “Glowing Scorpion Exoskeletons May Be Giant Eyes“:
Scorpion bodies are studded with eyes, sometimes as many as twelve — and scientists may have found one more.
A scorpion’s entire exoskeleton may act as one giant light receptor, a full-body proto-eye that detects shadows cast by moonlight and starlight.
That’s still just a hypothesis, but it would help explain why they glow so brilliantly under ultraviolet light.
Twelve eyes? TWELVE! Little bastards.
In early May I spotted the first scorpion of the year in the house. In the last few years I have been living here, this is the earliest I have seen on in the house. In previous years I didn’t start to see them until July.
I was sure they were coming in from the garage so I put diatomaceous earth throughout the garage and around the entrances to the house. Diatomaceous earth works good on insects because it’s very itchy to insects and it will suck the moisture out of their bodies. In the case of scorpions I’ve read that they will just avoid it.
Tonight I came home and found Saturn playing with something. The good news is Saturn found a scorpion the bad news is the scorpion made it past my defenses. That means that it either went around the diatomaceous earth or it came in another way.
I will start going around the perimeter of the house sealing up cracks. I’m not sure what else to do.