Colored scanning electron micrograph (SEM) of Biting midge head (Family Ceratopogonidae). Biting midges are a family of small flies belonging to the order Diptera (flies). They are also known as midges, sand flies, gnats, no-see-ums or punkies in North America. They are closely related to the insect families: Chironomidae, Simuliidae (or black flies), and Thaumaleidae. They are found in almost any aquatic or semi-aquatic habitats throughout the world, as well as in mountain areas. Females of most species are adapted to suck blood from animals. Magnification: x14 when shortest axis printed at 25 millimeters.