cockchafer vs coleopteran

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. 

coleopteran

noun
  • Any insect of the order Coleoptera; includes the beetles, weevils and fireflies 

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