June bug vs dung beetle

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 

dung beetle

noun
  • Any of the true dung beetles of subfamily Scarabaeinae. 

  • Any of the beetle of the family Scarabaeidae (scarab beetles), especially of the subfamilies Scarabaeinae and Aphodiinae, noted for rolling dung into balls for use as food or as brooding chambers. 

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