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Dear Kurt,

If this species has only 5 dorsocentral bristles, then there is a good chance that you are dealing with Achalcus cinereus (females have the antenna nearly entirely black, see Pollet 1996). At least this specimen has the sternites dark, which is typical for this species as well. If you don't find this reference on internet, get in touch with me: mpollet.doli@gmail.com. I would be glad to share this old but still relevant paper with you.
Cheers,
Marc