cleg vs horsefly

cleg

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

  • A light breeze. 

horsefly

noun
  • Any of several medium to large flies, of the family Tabanidae, that suck the blood of mammals (not to be confused with Stomoxys calcitrans, the stable fly, or dog fly). 

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