Scorpions in this category may be crevice-dwelling generalists, e.g., bark scorpions like Centruroides ssp., which will use any kind of crevice for a retreat, or they may prefer only certain types of crevices. Some species are capable of burrowing, e.g., Liocheles australasiae , but are normally found in crevice environments. These I would term facultative burrowers. Morphological adaptations in this group do not follow any strict rules and seem to be affected by size and geneology. On the other hand, large buthids, e.g., some species of Centruroides, may be very slender with long metasomas and are not particularly flattened.
Most errant scorpions appear to be generalists.
They may be found under a rock on one ocassion, under the loose bark of a tree on another, inside of a rotten log on another, or even on the walls of a human dwelling. It is more difficult to identify crevice dwelling specialists because the habits of most species are not well known. I prefer to restrict the term to those scorpions that live specifically in weathering cracks in rocks and cliff faces. Hadogenes is the best example of a truly lithophilic scorpion. They are seldom found away from the rocks that provide them with shelter.