Genus Syrphus (Syrphidae, Diptera) in Galicia
There are only three species:
-S. ribesii
-S. torvus
-S. vitridipennis
S. torvus can be IDed because in both sexes it has hair on its eyes. Under direct sunlight, this makes white reflections, but seems difficult to see otherwise.
As for S. ribesii and S. vitridipennis, the males are practically identical (other than genitalia and micropilosity of the wings), but the females are different because in S. vitridipennis 3/4 of the hind femora are black, and in S. ribesii yellow.
Sources:
https://en.wikipedia.org/wiki/Syrphus_ribesii
https://www.mapress.com/zt/article/view/zootaxa.4216.5.1
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