 The first part of the wing has a large grey middle band.It differs from the poplar kitten ("Furcula bifida") in its generally smaller size, but more especially in the shape of the black line forming the outer margin of the central band; this is always more or less angled or dentate towards the front margin of the wings, whereas, in the poplar kitten, this portion of the line forms a clean curve.The flight period ranges from April to the end of August.