June bug vs cockchafer

June bug

noun
  • European chafer (Rhizotrogus majalis/Amphimallon majalis), a beetle native to continental Europe, but now also in North America 

  • ten-lined June beetle (Polyphylla decemlineata), of the western United States and Canada 

  • Phyllophaga, a genus of beetles in the subfamily Melolonthinae of the family Scarabaeidae, also known as June beetles. 

  • green June beetle (Cotinis nitida), of the southeastern United States 

  • fig-eater or figeater beetle (Cotinis mutabilis), of the western and southwestern United States 

cockchafer

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

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

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