Snakefly is about 20mm length, and is immediately understood in the peculiar form of brisket which is extended for a long time and has become jaw-like. The body is long and slender and a front mouth style head has the compound eye projected forward and ahead strongly back.
It sees in many cases that the imago has stopped on a leaf etc. a larva is lived in land, and its body is long and slender, and only its head and brisket back are hardeinged in the dark color, and the parts except these are soft. It lives under the bark of a dead tree etc., and preys on other Insecta.