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book scorpion

British  

noun

  1. any of various small arachnids of the order Pseudoscorpionida (false scorpions), esp Chelifer cancroides , which are sometimes found in old books, etc

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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One such helper not normally found in artificial hives is the book scorpion.

From Washington Post