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Caught yesterday (14-6) in the Netherlands.

Could this be Leia arsona?

Thanks in advance.

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Wing

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How far are the ocelli from the eye margin? The key to Palaearctic Mycetophilidae says

Lateral ocelli touching eye margins. Fork of CuA slightly before apex of Sc ... Clastobasis Skuse
Lateral ocelli not touching eye margins. Fork of CuA beyond level of apex of Sc ... Leia Meigen

I think your CuA forks before the tip of Sc. If the ocelli are far from eye margins, consider also Greenomyia.

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John,

Thanks for your reply. I have checked and
1. The lateral ocelli touch the eye margin.
2. CuA does not really fork, CuA1 seems to be a `loose` vein. It starts however just before, or at, the level of apex of Sc.

The above leads me to Clastoblasis, of wich only one species is known for the Netherlands (C. alternans).

Do you agree?

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There is a second species from nearby (C. loici Chandler 2001) but I do not know what either looks like.

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Chandler (2001) separates Clastobasis from Leia as follows: -

"It agrees with most of the characters listed for Leia, except for vein sc-r (Sc2 in the key) being absent and the wings being clear yellowish without any marking; at least a subapical wing band is usually present in British species of Leia. It also differs in the lateral ocelli being closer to the eye margins and the branches of the median fork at least slightly convergent apically, M, being downturned apically."

This look like a typical Leia to me but obviously not arsona.

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Thanks Empeejay.

This proves again how difficult it is to identify from a photo. As long as i don't have a proper key, i will stick to Leia/Clastoblasis.