Smithsonian Report, 1939. — Back 



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Plate 6 



Bookworm Destruction ofThreads Used To bind Pages of Book Together, 

 Causing the pages Thus Freed To Fall Out. 



a, Left, heavy jute thread from sack damaged by larvae of Lasioderma serrkorne, indicating ease with which 

 threads are cut and ruined by boolcworm larvae as they burrow in books. 



