Diptera.info :: Identification queries :: Diptera (adults)
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 Stratiomyidae, Beris
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| MorganA |
Posted on 08-11-2023 22:59
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Member Location: Posts: 1069 Joined: 13.05.20 |
I am a bit puzzeled about this Beris, I thought either chalybata or morressii, but the narrow frons that clearly widens towards the antenna makes me confused. South Norway 20th July 2023 MorganA attached the following image:  [295.68Kb] |
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| MorganA |
Posted on 08-11-2023 22:59
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Member Location: Posts: 1069 Joined: 13.05.20 |
2
MorganA attached the following image:  [288.61Kb] |
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| MorganA |
Posted on 08-11-2023 23:00
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Member Location: Posts: 1069 Joined: 13.05.20 |
3
MorganA attached the following image:  [289.59Kb] |
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| Zeegers |
Posted on 11-11-2023 09:54
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Member Location: Soest, NL Posts: 18785 Joined: 21.07.04 |
I don’t see the problem. Vertex is the uppermost part. Theo |
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| MorganA |
Posted on 11-11-2023 20:21
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Member Location: Posts: 1069 Joined: 13.05.20 |
Well, I have not seen that many B. chalybata or morrisii, but compared with the ones I have in my collection it seems so off. I took a picture that illustrates how different it is from the B. chalybata and B. morrisii I have in my collection
MorganA attached the following image:  [289.7Kb] Edited by MorganA on 11-11-2023 20:22 |
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| Zeegers |
Posted on 12-11-2023 19:26
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Member Location: Soest, NL Posts: 18785 Joined: 21.07.04 |
All these have completely yellow legs ? Theo |
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| MorganA |
Posted on 12-11-2023 20:19
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Member Location: Posts: 1069 Joined: 13.05.20 |
All of them have completly yellow femur and tibia yes. I add a lateral pic of all of them as well.
MorganA attached the following image:  [293.3Kb] |
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| Zeegers |
Posted on 12-11-2023 23:27
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Member Location: Soest, NL Posts: 18785 Joined: 21.07.04 |
OK, interesting. so the one top right is clearly morrissii, and the others are clearly not. Note the difference in the green. in the other two, the antenna is remarkably slender, so I am wondering if these might be geniculata. Theo Edited by Zeegers on 12-11-2023 23:28 |
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| MorganA |
Posted on 13-11-2023 15:15
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Member Location: Posts: 1069 Joined: 13.05.20 |
Thank you, shouldn't at least the top left one be chalybata? geniculata should have dark legs shouldn't it? |
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| Zeegers |
Posted on 13-11-2023 22:04
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Member Location: Soest, NL Posts: 18785 Joined: 21.07.04 |
OK, so 2 = morrissi no doubt, 1 seems to be chalybata, but still the antenna seems too long (better pic might help / are you very sure it is the same specimen ?) 3 is challinging. It is neither of two above nor fuscipes. According to Rozkosny in Fauna Entomologica Scandinavica, you don't have geniculata and he mentions that the vertex in nigra (as strobli) is slightly narrower than in chalybata. If you check the hind legs, there are indications of dark rings. So, I am still a bit confused, but that is what is should be, I guess. Check the leg colouration for yourself, I'd say. Theo |
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| MorganA |
Posted on 14-11-2023 17:39
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Member Location: Posts: 1069 Joined: 13.05.20 |
Thank you, good we agree on #2. Yes #1 is the same specimen, I also add a better picture of the antenna of #1. When it comes to #3 the indication of dark ring that might be on the picture of hind leg must be due to lightning. Hind tibia and femur is clearly completly yellow when looking at them in microscope. So that one remains a challenge..
MorganA attached the following image:  [289.69Kb] |
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| Zeegers |
Posted on 18-11-2023 11:42
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Member Location: Soest, NL Posts: 18785 Joined: 21.07.04 |
but your vertex is much broader in this pic than in your original number 3. Ot at least, so it seems. This last pic with totally yellow legs equals chalybata without any difficulty, I’d say Theo |
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| MorganA |
Posted on 18-11-2023 17:44
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Member Location: Posts: 1069 Joined: 13.05.20 |
Thank you, yes this is the #1 the one i thought was chalybata. so then that one is setteled as well. Did you want a better picture of antenna from specimen 3 as well? |
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| MorganA |
Posted on 22-11-2023 20:39
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Member Location: Posts: 1069 Joined: 13.05.20 |
Antenna of # 3
MorganA attached the following image:  [297.43Kb] |
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