Lymnastis is a genus of ground beetles of the subfamily Trechinae. The body length of the adult is 2.0–2.2 millimetres (0.079–0.087 in). Body-color is yellow and flat. Representatives of this genus are characterized by the following features: * Head is small and narrow; * Compound eyes are usually large and are made up of about ten of the facet cells; * Frontal supraorbital notch is reduced; * Prischitkovaya groove on top is not bent; * The elytron have fine hairs and have no return grooves; * Vertex of the Abdomen appears from the elytron; * The upper body is covered in soft hairs.