cleg vs warble fly

cleg

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

  • A light breeze. 

warble fly

noun
  • Any member of the genus Hypoderma of large flies, parasitic on cattle and deer. 

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