Diptera.info :: Identification queries :: Diptera (adults)
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 Chrysops. Sp. N4
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| Nikita Vikhrev |
Posted on 14-07-2006 12:53
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 Member Location: Moscow, Russia Posts: 9349 Joined: 24.05.05 |
Moscow region, 14july, 9mm. Certanly black leg, but not Ch. caecutiens. Chrysops nigripes? Nikita Vikhrev attached the following image:  [60.33Kb] Nikita Vikhrev - Zool Museum of Moscow University |
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| Tony Irwin |
Posted on 14-07-2006 18:09
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 Member Location: Norwich, England Posts: 7236 Joined: 19.11.04 |
Wow! That's a handsome fly!  However, I think it is a dark caecutiens, not nigripes. Starting at the head - The frontal callus and vertex are exactly as they should be in caecutiens. In nigripes the black area of the vertex is much smaller. Thorax - nigripes has a broad central shining stripe as well, so the dusting is much reduced. Wing - the apical spot is quite large, occupying 3 quarters of R4. In nigripes the spot is much smaller, with only the apical third of R4 darkened. Abdomen - the yellow side patches are more like caecutiens (in nigripes they are smaller), but the central yellow patch is missing. Apparently the extent of yellow is variable in caecutiens, and some specimens can be all black (like sepulcralis). Tony ---------- Tony Irwin |
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| Nikita Vikhrev |
Posted on 14-07-2006 19:08
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Member Location: Moscow, Russia Posts: 9349 Joined: 24.05.05 |
Thank you Tony. "Wing - the apical spot is quite large, occupying 3 quarters of R4. In nigripes the spot is much smaller, with only the apical third of R4 darkened" I did find this too, but didn't dare to think that nevertheless caecutiens! Nikita Nikita Vikhrev - Zool Museum of Moscow University |
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