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There is, unfortunately, no key to the syrphidae of the Iberian peninsula :(
Reason why I am shipping some specimens to Alicante today.
So, if you like to do some nessecary work: write this key! ;)

Anyway, there are some sources on the internet. On Mark van Veen's site you may find some help (but does not contain all spanish species, so be carefull):
http://home.hccne...index.html
Then there are several sites with pictures, that can help you. To mention two:
www.syrphidae.com (which is currently offline)
http://perso.wana...aix/L.html

Have fun!