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 Chalcosyrphus ?
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| Eugene K |
Posted on 18-07-2020 20:26
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Member Location: Posts: 578 Joined: 10.03.18 |
2020_07_06 Russia, Novgorod district. Please, help id. Edited by Eugene K on 18-07-2020 20:29 |
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| Sundew |
Posted on 19-07-2020 02:00
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 Member Location: Posts: 3890 Joined: 28.07.07 |
There are three similar Chalcosyrphus species in your region: C. femoratus, C. valgus, and C. rufipes. In a Swedish paper (https://docplayer...hidae.html) a key is given, which I just translated. - I would exclude C. femoratus that I saw some years ago (see https://diptera.i...d_id=48510, because your fly does not have yellow haltere knobs. C. femoratus males have long hairs on tibiae 1 and 2, but your fly is a female, so this character is not helpful. C. valgus and C. rufipes can be told apart by the colour of the short, spiny bristles on the underside of the middle tarsus. In C. rufipes these bristles are black, whereas C. valgus has yellow bristles. Unfortunately, this character is not visible in your picture, so we are stuck with "Chalcosyrphus spec.", sorry! Regards, Sundew |
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| Eugene K |
Posted on 19-07-2020 21:08
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Member Location: Posts: 578 Joined: 10.03.18 |
Sundew, thank you! |
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| Philippe moniotte |
Posted on 11-02-2021 18:47
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 Member Location: Posts: 852 Joined: 14.10.05 |
Arista entirely reddish points to valgus, it seems.
A beautiful hypothesis can be slain by an ugly fact. www.entomopix.eu |
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but don't see the image in the post.
