Most species have a conspicuous keel or ridge between the legs which extends backward into a point. The hind legs have long hairs that aid in swimming. The tail filaments are usually short. Some species of males stridulate or chirp to locate mates. Pupation is generally terrestrial.
Mouthparts are for chewing.
They are usually found in ponds, shallow lakes and along the shoreline of flowing water, although one subfamily is found in dung. Most larvae are predaceous, although some feed on plants. Adults may be found at lights. None, this is a beneficial insect. For additional information, contact your local Texas extension service agent, or search for other state extension service offices.