An important component of integrated pest management in natural history museums is the identification of pest insects. A small number of Anthrenus spp. can be encountered including A. verbasci, varied carpet beetle, and A. sarnicus, Guernsey carpet beetle. A species that would reasonably be expected to be found in natural history museums is A. museorum, museum beetle. However, the museum beetle is rarely, if ever, found indoors. A possible reason for this is provided. Identification of four Anthrenus spp. is considered including potential sources of confusion and levels of variation that need to be taken into account.<\/p>\n