Cast skins and frass in the form of minute, irregular pellets are frequently found on infested fabrics. Black carpet beetle larvae may live as short as 9 months to as long as 3 years, depending on their diet and environmental conditions. Larvae pupate in the last larval skin, with the pupal state lasting from 6 to 24 days. Much surface damage with various holes. Frass may be seen in minute, irregular pellets, many time in the color of the fabric.
Cast skins, no webbing.