The term ?Midge Fishing? is both a specific and generic term when applied to fly fishing; specific when it?s speaking about a certain type of insect and generic when it?s speaking about a method of fishing. Midges are insects that belong to the Diptera family which includes a variety of two-winged insects including gnats, black flies and mosquitoes. Most midges are relatively small, with the exception of some lake midges, and the term has been applied to many types of small flies which are not technically midges. Fishing small flies is a specialized method of fly fishing and certainly one of the more challenging methods. The term midge has become synonymous with any small insect and many anglers consider any fly that is smaller than a size 18 as a midge.