Additional observations on Dermestidae (Coleoptera) Additional observations have been described on some life patterns ofDermestes maculatus andDermestes lardarius, two species of the familyDermestidae (Bacon or Skin Beetles). The pupation of the larvae in the wood and the form of their cavities are dealt with; only fungal infected wood is attacked byDermestes. The present observations have also shown thatDermestes do not digest wood. Beetles and larvae consume mainly pure fats or food substances with fatty components. Anatomically certain elements of the mouthparts of the beetles seem to be typical constructed for the fatty nutrition. The hairlike sense organs in the antennae for the reception of smell are most important in locating the food.