fruit fly vs mantis

fruit fly

noun
  • any insect of the Drosophilidae family, whose larvae feed on ripening fruit, especially the species Drosophila melanogaster that is used in genetic research. 

  • A woman who enjoys the company of homosexual men; a "fag hag". 

  • any insect of the Tephritidae family, whose larvae damage plant tissue. 

mantis

noun
  • Any of various large insects of the order Mantodea that catch insects or other small animals with their powerful forelegs. 

  • A green colour, like that of many mantises. 

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