Adult beetle is oblong to oval in shape c. 2.6-4.6mm in body length, head and pronotum dark red coloured, elytra with light brown and dark brown to black striations running across the body. Larvae 3-6.5mm long, light yellow-brown in colour and have arrow shaped hair dorsally as well as several bristle setae extending 3-4mm from the end of the abdomen.
Generic separation of various Derrmestid adult and larvae.
1. Medium ocellus absent - Dermestes
Medium ocellus present - Go to 2.
2. Body covered with colourful scales - Anthrenus
Body covered with hairs not scales - Go to 3.
3. First segment of hind tarsi half or less the length of second segment - Attagenus
First segment of hind tarsi as long or longer than second segment - Go to 4.
4. No distinct antennal club, all segments gradually enlarging from base to apex - Trogoderma
Distinct 3 segmented club, these segments considerably larger than remaining segments - Anthrenocerus
1. Ninth abdominal segment with horn-like structures - Dermestes
Ninth segment without horn-like structures - Go to 2.
2. Dorsal surface without barbed arrow-shaped setae - Attagenus
Dorsal surface with barbed arrow-shaped setae - Go to 3.
3. Tufts of barbed setae do not overlap along the midline - Trogoderma & Anthrenocerus
Tufts of barbed setae overlap on midline - Anthrenus
Source: See Rees (2004) in references