Black like a black sesame seed bug will fly is a midge. Midges are a small insect of the order Diptera, commonly known as "small bite", "ink mosquito", the body length of only 1-4 millimeters, the adult was black or dark brown, stopping on the human body at first glance like a "black sesame seeds ", often in the woods, weeds, caves and other places to avoid the wind and light.