Pour les deux espèces que tu cites j'ai trouvé ceci.
Brachymeria femorata = fémur 3 jaune-noir-jaune.
Brachymeria tibialis = fémur 3 noir-jaune. (Brachymeria tibialis = Brachymeria intermedia).
Si tu veux traduire, tu as aussi ce lien.
https://www.royensoc.co.uk/sites/default/files/Vol08_Part02a.pdf
Second large tergite of gaster, near mid-line, for the most part coarsely punctate,
the punctures often separated by less than their own diameters : right mandible
wjth a minute middle tooth : scutellum strongly and sharply bilobed at apex :
epicnemial carina sharply bilobed medially : propodeum appearing dentate
behind spiracle, if viewed at an angle : hind femora yellow at base and apex :
second flagellar segment transverse in male ..... femorata
Second large tergite of gaster much more finely punctate above : right mandible
clearly tridentate : scutellum weakly bilobed at apex : epicnemial carina more
or less bluntly bilobed medially : propodeum scarcely dentate behind spiracle :
hind femora not yellow at base : second flagellar segment longer than broad in
both sexes: (hind tibiae dark-marked in middle in var. scirropoda Forst.) ... intermedia
Il existe sans doute d'autres critères d'identification, tu regardes les différents sujets sur LMDI.
Attends le passage des experts pour confirmation Brachymeria sp pour l'instant.