Purdue University
Purdue University: Medical Entomology: Horse and Deer Flies
Horse flies and deer flies are significant pests to both humans and animals. This site describes their life cycles, feeding patterns, and some methods of controlling them.
Encyclopedia Britannica
Encyclopedia Britannica: Horse Fly
This article describes horse flies, including the kinds of diseases they can carry and how to control them.
Curated OER
Encyclopedia Britannica: Diversity Among Dipterans
Drawing of a wide variety of members of the Order - Diptera, including the horse fly and the mosquito.