European chafer vs scarab

European chafer

noun
  • A beetle, Amphimallon majale, native to continental Europe, now an invasive species in North America. 

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 European chafer and scarab occurred in a corpus of books? (source: Google Ngram Viewer )