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I'm not sure I could tell the two Pediacus species apart on that photo. P. dermestoides is much more frequent than P. depressus.
Yes it is not the best photo (the beetle arrived at a moth trapping so my attention was elsewhere). I could send you a higher resolution copy (not sure how to upload a 2nd image here without creating a new observation).
My id was based on comparing these photos:
and also the WCG description, esp of pronotum shape. On my photo (perhaps not this version) the pronotum looks square and not transverse.
at the top of the observation and you can add a photo.
Howardian Local Nature Reserve
OK I've uploaded the original photo without reduction. Does this help getting to species level? It would be really good to confirm if possible.
Colour, though maybe not definitive, suggests P. depressus.
I've compared my specimens side by side and your photo does show the more quadrate pronotum of depressus. I'm pretty confident that's what it is though I'd be happier if I could see the distinctive pronotal hind-angles. I know a couple of lifelong coleopterists who've never seen this species.
Thank you for taking the time to examine this so carefully. According to the NBN site this is the first sighting since 1913 in London and only the 2nd ever inside the M25 area. It should help raise awareness of the importance of Abney Park Cemetery Nature Reserve as a precious London site for woodland invertebrates.
Lat/Lng: 51.564424, -0.077383
OS grid ref: TQ333868