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I fail to identify this Ulidiidae. In the manual of palaearctic diptera the first point in the key is if vein R1 has bristles, I don't see them, but then I end up with Seioptera which should be incorrect. Could it be a Tetanops with bare R1?

At light on the shore of lake Buir Nuur in Mongolia, 1th of June 2024.

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A Timia (s.str.) sp. -- one of the many. The genus needs revision and the photos are not show the face anterior view.

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The problem of the Manual is that the subfamily Ulidiinae (then considered to be a family) has never been written, so try to use Hennig 1940, though Zaitzev and Galinskaya have described a few new Timia since them, including the Mongolian ones.

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Thank you! That explains why I often have problems using the key in manual of palaearctic diptera! I thought Otitidae and Ulidiidae were the same.

I tried keying with Hennig 1949 and ended up with Timia protuberans. I could exclude the species described by Galinskaya. Unfortunately I don't have Zaitzev 1984, I will try to get it from the library.

See attached some extra photos from the head:

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Generally, potuberans must have 2 black marks below the antennal grooves (uniformly yellow here) and 3 whitish pollinose vittae on the frons (not visible here, but looks like frons is uniformly subshining).

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protuberans SYNTYPE

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ST

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ST