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With such an extention to first flagellomere this must be Cerodontha subgenus Cerodontha (does it have one pair of scutellar bristles?). try using Nowakowski 1973, i suspect it will be in the C.affinis (Fall.) group but not one we have here in GB (unless it is a form of affinis with dark scutellum). I would not like to name these to species without dissection.