deer fly vs tabanid

deer fly

noun
  • A gold- or green-eyed horsefly of the genus Chrysops in the family Tabanidae; pests to cattle, horses and humans, feeding on their blood. 

  • A Eurasian species of louse fly in the family Hippoboscidae, Lipoptena cervi; parasites of elk, deer and other bovine animals, sucking blood and laying eggs in the fur of the host animals. 

tabanid

noun
  • A horsefly. 

adj
  • Of or pertaining to species of the horsefly family, Tabanidae. 

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