About 15mm long
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Hi Jon, are they similar in size? If anything this one might appear a tiny bit more elongate than the S atrata Ive seen, but its so marginal it might just be the photo?
The punctures on the elytra (looks like shiny bumps too?) look 'neat and tidy' more like those of S. tristis (but I'm not a coleopterist).
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I initially assumed it would be S.atrata but the fine puncturation makes me suspect it might just be S.tristis which is much rarer in our area. I estimate the length as 15mm which is inconclusive as S.atrata can be 10-15mm and S.tristis 13-17mm. Awaiting an expert opinion although I see there are several other Silpha sp. observations on ispot which haven't been resolved yet.
I don't actually have a written reference to this but think that a key feature is the antennae which look more clubbed with tristis. I'll post a couple of pics of what I think is a tristis and you can see that the distal four segments are slightly wider. On yours the antennae get if anything narrower towards the tip suggesting atrata.
Jamie from Briantspuddle
There's a begginners guide to Silpha sp. free to dowload at - http://www.amentsoc.org/publications/beetle-news/2009/beetle-news-vol-01...
I think this is Silpha tristis.
Will check out that guide next...
I've uploaded some more images to hopefully display some of the features mentioned in the key. Thanks for the link Steve. I'm risking an id. of S.tristis, the shining tubercles seems to be the clincher.
You additional images show all the 'key' characters, so I ran it through the AES key and I agree with S.tristis.
OK changed my mind on yours - antennae clearly look clubbed and the 'snout' isnt that long. Plus 'shoulders'.
Lat/Lng: 51.47384, -2.57592
OS grid ref: ST600751