This probably doesn't pertain to your little fellow, but some species of pseudoscorpion hitchhike on large longhorned beetles in the Western Hemisphere tropics. We found one on a long-armed harlequin beetle in Ecuador.

The pseudoscorpions live inside the excavations of other insects in the same rotting tree or log species as the beetle larvae, and climb aboard the adult when it emerges from pupa. When the beetle flies, breeds, and visits a new log or tree for egg-laying, the little riders are able to conquer new worlds they couldn't dream of reaching by foot.

Whether the beetles receive some benefit in return is still a matter of speculation.

Maybe Chelifer cancroides, but that's just a guess. See photos at This site