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This is probably the most exciting fly found so far in the Galicia sample. Collected in north-west Spain 19.x.2007. It keys easily to Ceromya then in Andersen's Ceromya key it goes:

- vein R1 completely setulose dorsally and apically on the ventral surface
- body colour very yellow with darker mesonotum - abodmen shining, undusted
- antenna-3 very rounded - suboval

C.dorsigera is described as 'an extremely rare Eurasian species known only from a very few specimens'. Tantalizingly, one of the recorded specimens comes from 'northern Spain'.

:)

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another angle...

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another angle...

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Could be, if you are sure about the genus (no Ceranthia ?)


Theo

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I ruled out Ceranthia because the lower katepisternal bristle is much smaller than the upper anterior one and the anal vein doesn't reach the wing margin :)

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I doubt the rarity of this species. It was recently found as new for Finland from Malaise traps. 3 out of 20 traps on the Åland islands yielded this species (a total of 6 females). I suspect it (and the other predominantly yellow Ceromya, C. silacea) are mostly active at dusk or even during the light summer nights here in the north. C. silacea is pretty common in Malaise trap materials here, but still very rarely found by netting even when the trap surrounding have been extensively covered by sweep-netting.

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Interesting observation Kahis ... this was sweep-netted but, like you, I am sure that many species would seem much commoner if we all ran more Malaise traps :D

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As a follow-up - the determination of Ceromya dorsigera has been confirmed by Peter Tschorsnig :)