deerfly

noun

1. Any of various species of fly which feed on deer, principally in genus Chrysops.

   “When the sun comes out, it is totally delightful, except for the mosquitoes, and the blackflies, and the deerflies.”

   “The basement was flooded and the couch was growing mildew, so we sat outdoors in the shadows of the trees in a screened tent with deerflies and mosquitoes buzzing outside.”

   “It was not a horsefly and it was not a deerfly; it was bigger than either.”