Petasanthes leucactis is a moth in the Depressariidae family, and the only species in the genus Petasanthes. It was described by Meyrick in 1925. It is found in Ecuador. The wingspan is 26-29 mm. The forewings are deep orange with the costa narrowly black towards the base, from before one-third with a gradually expandedblack marginal band widest opposite the apex, where it occupies one-third of the wing, and then rather narrowed along the termen to below the tornus, cut by whitish streaks on all veins. There is a round blackish spot on the transverse vein. The hindwings are orange, with a small blackish spot on the transverse vein, and a moderately broad blackish border cut by indistinct orange lines on the veins around the apex and upper three-fourths of the termen. There is some blackish