Full Ghillisuit, bug repellent, and balls of steel because these are scary to tame! They have the taming slot right behind their head about where the saddle would normally sit. Must approach from behind and only approach when feeding, stay away otherwise
In the south cave there is water lure them to it and use spoiled meat to tame them in water they will stop attacking you and just chill use a 10x balm on a 150 its like a 2 minute tame they also don't have oxygen so it's easy
All you have to do is tame a scorpion and ride up to an arthro on the scorpion and feed it spoiled meat. The arthro will not aggro on you while you are riding the scorpion. I did this on my mobile world so I can confirm that this works at least on mobile.
Easiest and safest way to tame this is to lure it under water. They stop aggro and you can tame as you please. Just make sure you come up for air every once in a while. Also be sure the water is deep enough.