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Five species of Stenus have orange spots on the elytra, but I don't know how to tell them apart :-(
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The five species with orange spots are...
S. kiesenwetteri. (abdomen without distinct raised margins).
S. biguttatus. (legs entirely black)
S. comma. (legs entirely black)
S. guttula. (legs never entirely black)
S. bimaculatus. (legs never entirely black)
S. bimaculatus will have basal tergites with central keel. S. guttula will lack these.
Dianous coerulescens also has these spots.
Thanks Chris. I'm always looking to learn more! On the basis of above, I have to agree with your ID. I have some 'spotty Stenus' from my pit-fall traps. I'll give'em a go.
Best wishes Steve
Hi Christian and Steve,
I didnt put the ruler to this one but I had a very good look at it as I thought the size would be important, I'd say a good 10mm. Thansk for all the help.
Lat/Lng: 54.51, -7.902
OS grid ref: NV181287