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 Chrysotoxum (Syrphidae)
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| Rui Andrade |
Posted on 27-09-2007 12:35
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 Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Are these two of the same species? Thank you location: Oporto, Portugal date: 2007/09/26  
Edited by Rui Andrade on 05-11-2007 19:05 |
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| jorgemotalmeida |
Posted on 27-09-2007 12:48
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 Member Location: Viseu - PORTUGAL Posts: 9279 Joined: 05.06.06 |
Another good one for Mimicry diptera!  |
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| jorgemotalmeida |
Posted on 27-09-2007 13:10
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Member Location: Viseu - PORTUGAL Posts: 9279 Joined: 05.06.06 |
Syrphidae... both... different species. |
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| jorgemotalmeida |
Posted on 27-09-2007 13:27
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Member Location: Viseu - PORTUGAL Posts: 9279 Joined: 05.06.06 |
Both are Chrysotoxum. |
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| Rui Andrade |
Posted on 27-09-2007 13:53
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Thank you, Jorge stratiomyidlike syrphids  ......at least for me |
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| Andre |
Posted on 27-09-2007 16:29
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 Member Location: Tilburg, the Netherlands Posts: 2111 Joined: 18.07.04 |
Hi Rui! The top picture looks like Chr. festivum. The second like a Chr. intermedium. Please collect them next time you see them (and any other Syrphids too ). |
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| Rui Andrade |
Posted on 27-09-2007 21:01
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Thank you, Andre Actually, I collected the two specimens. I just put them in alcohol, but one of them had been dead for more or less 24 hours and I'm not sure if it was too long without it being in alcohol. Just one question: are there any problems in putting more than one insect in the same jar? |
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| Tony Irwin |
Posted on 28-09-2007 18:27
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 Member Location: Norwich, England Posts: 6965 Joined: 19.11.04 |
No problems, if they're from the same locality on the same date!  Just occasionally, filling a jar with flies will dilute the alcohol so much that they are not properly preserved.  This is only likely to happen if the volume of flies equals the volume of alcohol.Tony ---------- Tony Irwin |
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| Rui Andrade |
Posted on 29-09-2007 14:30
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Ok, thank you Tony |
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| John Smit |
Posted on 29-09-2007 14:57
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 Member Location: Utrecht Posts: 565 Joined: 05.10.04 |
Ehh. slight correction to the identifications. Top one is C. intermedium and the second one is C. octomaculatum, to my opinion. John |
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| Isidro |
Posted on 29-09-2007 16:09
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Member Location: Zaragoza, Spain Posts: 1924 Joined: 26.04.07 |
Tony Irwin wrote: No problems, if they're from the same locality on the same date! But a thread of mine with six species in the same genus (Bombus) and same locality and same date, was closed before begin... I thinks that is better post one species per thread... |
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| crex |
Posted on 29-09-2007 17:13
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 Member Location: Sweden Posts: 1996 Joined: 22.05.06 |
Isidro wrote: Tony Irwin wrote: No problems, if they're from the same locality on the same date! But a thread of mine with six species in the same genus (Bombus) and same locality and same date, was closed before begin... I thinks that is better post one species per thread... A jar and a thread is not the same thing  |
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| Rui Andrade |
Posted on 29-09-2007 17:28
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
John Smit wrote: Ehh. slight correction to the identifications. Top one is C. intermedium and the second one is C. octomaculatum, to my opinion. John I'm very confused :-S. John, can you explain me your hunch? What caracteristics you see to separate the species? |
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| John Smit |
Posted on 29-09-2007 17:48
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Member Location: Utrecht Posts: 565 Joined: 05.10.04 |
The abdominal pattern of the first species doesn't fit C. festivum, the spots are to broad. The fact that it has a dark band along the entire front of the wing and the glabrous look of the abdomen and the relative short abdomen make it C. intermedium for me. The second one, if you closely at the fourth tergite, you see a very small yellow band from the yellow spot to the front of the tergite. Not the lateral side itself, but just before, this is characteristic for C. octomaculatum. I jope this answers your question John |
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| pierred |
Posted on 29-09-2007 21:04
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 Member Location: Paris (France) Posts: 1376 Joined: 21.04.05 |
John, Thanks for those explanations. It makes us do some progress. Pierre Duhem |
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| Rui Andrade |
Posted on 29-09-2007 21:15
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Thank you very much, John . Pierre is right, those explanations help us a lot. |
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