cockchafer vs scarab

cockchafer

noun
  • Any of various other similar beetles, such as of the genera Acrossidius, Cyphochilus, Rhopaea, etc. 

  • Any of the large European beetles from the genus Melolontha that are destructive to vegetation. 

scarab

noun
  • Any species of beetle belonging to the family Scarabaeidae. 

  • A beetle of the species Scarabaeus sacer, sacred to the ancient Egyptians. 

  • A symbol, seal, amulet, or gem fashioned to resemble the sacred beetle. 

How often have the words cockchafer and scarab occurred in a corpus of books? (source: Google Ngram Viewer )