Found evidence of a bad crab... - How to catch?

[Was moving some of my LR around today and found a Crab Claw...I don't know if crabs regrow their pinchers...but, he is one less right now....

How do I catch him? I knew he must have been in my tank, as I noticed some of my rubble mounts have been moved sometimes..(or pushed over)...Now I want him OUT!]
 
[Marc and Blide told me a little trick that worked on the first night for me. Use a smooth jar, i used a pub glass, and put a peice of meaty food in the bottom of it. Then Submerg the glass in the tank and lean it against the rock at a 45 degree or greater angle. The crab will go in to get the food then wont be able to climb out. Worked on the first night for me! Hope that helps.
Jason]
 
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