Horse Fly are larger than a House Fly (up to 1 in long) and dark-colored with clear wings. They have very large eyes that extend sideways. The females have a nasty bite.
Horse Fly are most abundant during the summer and only fly during the day. They breed in moist areas.
Could it be? Deer Fly, a species of Horse Fly, are smaller (.4 in long) and narrower with dark patches on their clear wings.
Did you know? Horse Fly can be traced back to the Late Jurassic period in China, 145-160 million years ago.