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(July 2010)| Horse-fly is the most widely-used English common
name for members of the family Tabanidae. Apart from the common
name "horse-flies", broad categories of biting, bloodsucking
Tabanidae are variously known as breeze flies, clegs or clags,
deer flies, gadflies, or zimbs. In some areas of Canada, they
also are known as Bull Dog Flies. In Australia some species are
known as "March flies", a name that in other English-speaking
countries refers to a very different Dipteran family, the non-
bloodsucking Bibionidae. The Tabanidae are true flies, that is
to say, members of the insect order Diptera. Tabanid species
that habitually attack humans and livestock are widely regarded
as pests because of the bites that females of most species
inflict, and the diseases and parasites that some species
transmit. The various species of Tabanidae range from medium-
sized to very large in size. Some species, such as deer flies
and the Australian March flies, are