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This is the best bumblebee-mimic ever seen, trust me.
Especially since the head is so small. Really, it's even better than the best Syrphidae, like Pocota and Arctophila. I've seen them all, this is the one !
Nikita, thanks for the additional information.
Porchinsky would indeed be the correct spelling in English transcription, but I wouldn't add to the already existing confusion in spelling.
(Portschinky no doubt being the German transcription)

Theo