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Hi Bart, it would help, if we could look into his face.
This are the differencies between the 4 resembling males:

- hind leg: tarsi and apex of tibia black => stramentarius
- hind tarsi reddish, rarely tips browned. 3rd tergite often with a black basal line... => terminatorius
- tips of mid tibia without a black patch on the inner surface. face completely or sides yellow. scutellum yellow. front coxa frequently yellow speckled. => melanotis (was macrocerus)
- tips of mid tibia with a black patch on the inner surface. face and clypeus mainly black. scutellum pale yellow. => extensorius