As Tony notes Book lice are an indicator of damp areas, as are the other species he identifies. They can be found in any type of collection or museum. Natural history collections have a great deal of paper work that can be affected, and book lice are as common there as in any other collection. However, psocids in great numbers indicate high relative humidity, which often leads to a mold problem. Check your ambient and localized relative humidity, increase your housekeeping efforts and improve air flow if possible.
Good luck! Gretchen Anderson Conservator Carnegie Museums of Natural History From: pestlist@googlegroups.com <pestlist@googlegroups.com> On Behalf Of Dr Tony Irwin Sent: Wednesday, December 7, 2022 9:34 AM To: pestlist@googlegroups.com Subject: Re: [PestList] RE: Determination CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. The booklice are a Dorypteryx species. Usually it is found in relatively low numbers - and has been associated with artworks on paper, rather than natural history collections. The first photos also show a young silverfish (Lepisma sp.), so there may be a humidity issue where it was found. The beetle on the right-hand side of the third photo (I can't see a fourth), is most likely an Adistemia species, again something more likely to be found in damper conditions. Tony Dr A.G.Irwin 47 The Avenues Norwich Norfolk NR2 3PH England mobile: +44(0)7880707834 phone: +44(0)1603 453524 On Wed, 7 Dec 2022 at 13:56, 'Edgley Cesar' via MuseumPests <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> wrote: I also think they’re booklice. The beetle is hard to tell from the photo but resembles plaster beetles e.g. Adistemia or Dienerella Edgley A. César – Curator, Diatoms Natural History Museum | Cromwell Road | SW7 5BD | London – UK From: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> On Behalf Of Mike van der Steenhoven Sent: 07 December 2022 13:44 To: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> Subject: [PestList] Determination Dear Pestlisters and colleagues, I hope you can help me identify the insects shown in these pictures. They are miniscule, they look like booklice but I am not shure. 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