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As far as I know, Chamaesyrphus is placed in Pelecocera in recent literature and it is considered a subgenus within Pelecocera. You can download the paper where this is shown here:

https://www.resea...characters

But yes, as Piet says, the recent work by Ximo only covers the 'real' Pelecocera:

https://www.zfmk....cera_0.pdf

I also need an updated key of Chamaesyrphus. I would be very grateful if somebody can provide it ;) Thanks in advance! :)