cleg vs forest fly

cleg

noun
  • A blood-sucking fly of the family Tabanidae; a gadfly, a horsefly. 

  • A light breeze. 

forest fly

noun
  • Any of numerous species of blood-sucking flies of the family Tabanidae. 

  • A fly of the genus Hippobosca, especially Hippobosca equina; a horse tick. 

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