More than 100,000 different kinds of flies have been discovered and named by scientists all over the world. Some common examples include house flies, horse flies, gnats, midges, and mosquitoes. All flies belong to the insect order Diptera, which means �two wings.� Since nearly all other insect groups have four wings, the name accurately reflects a unique feature of this group.
Archive version. For the most recent information see extension.missouri.edu.