To the two known species ¹) of this remarkable genus of the coleopterous family Silphidae I now add a third, sent over from Sumatra a long time ago by Dr. Salomon Müller. The new species, which may bear the name of Apatetica brunnipes, is allied to and of the same form and size as A. nitiduloides Westw., but can easily be distinguished by the different coloration and by the prolonged exterior acute angle of the elytra.