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i can see how flash can eliminate the irridesence on metallic insects (see example in gallery of polita, just as black as this one) but can flash photography really turn yellow antennae into black antennae? perhaps GB specimens are different but cyaneiventris here have very obviously yellow antennae.

also my specimens show very little difference in the green gloss on the thorax, it is the abdomen which is black in cyaneiventris, and my cyaneiventris have largely yellow tibia (one male confirmed by dissection), mostly black in polita. Incidently, in Rozkosny's key males are distinguished on male genitalia;)