Blister Fly
the name for any fly, using that term in its widest sense to designate any flying insect. The more common blister flies are beetles, and they are in consequence sometimes called blister beetles. That most frequently employed by medical men for raising raising blisters on the skin is the lytta vesicatoria, BLISTER STEEL formerly called cantharis vesicatorius. It feeds on the ash. It is indigenous in the south of Europe, and being, among other places, imported from Spain, is often called the Spanish fly.