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 Echthistus from Rhodes
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| piros |
Posted on 10-09-2019 18:18
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Member Location: Posts: 1762 Joined: 04.01.12 |
I found these flies at the end of May, 2019, near Faliraki. I think they are Echthistus cognatus, but I have my doubts... Can someone confirm (or correct) this tentativ ID? Thanks in advance! Greetings, Henrik Edited by piros on 10-09-2019 18:23 |
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| piros |
Posted on 10-09-2019 18:23
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Member Location: Posts: 1762 Joined: 04.01.12 |
Head.
Edited by piros on 10-09-2019 18:30 |
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| piros |
Posted on 10-09-2019 18:30
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Member Location: Posts: 1762 Joined: 04.01.12 |
Pair: |
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| piros |
Posted on 17-09-2019 18:51
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Member Location: Posts: 1762 Joined: 04.01.12 |
Nobody?  |
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| Quaedfliegh |
Posted on 18-09-2019 18:58
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 Member Location: Posts: 2198 Joined: 18.05.10 |
According to the key by Engel, cognatus should have black occipital bristles, these specimens do not have that but on the other hand, rufinervis should have entirely red tibiae without a black apex. So this must be a hybrid :-) Maybe someone has more info on this genus. I would love to hear....
Greetings, Reinoud Field guide to the robber flies of the Netherlands and Belgium: https://www.jeugdbondsuitgeverij.nl/product/field-guide-to-the-robberflies-of-the-netherlands-and-belgium/ https://www.nev.nl/diptera/ |
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| piros |
Posted on 18-09-2019 20:32
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Member Location: Posts: 1762 Joined: 04.01.12 |
Thank you for you reply! "I would love to hear...." So would I!  This was exatly the reason of my doubting my tentative ID, the lack of black bristles on the occiput! Just for the record, I can't see black occipital bristles on the specimen shown as E. cognatus here: https://www.miketaylornaturalist.co.uk/Checklists.html Edited by piros on 18-09-2019 20:56 |
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| piros |
Posted on 18-09-2019 20:45
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Member Location: Posts: 1762 Joined: 04.01.12 |
BTW, this fly is definitely larger than E. rufinervis I am used to. |
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| Quaedfliegh |
Posted on 18-09-2019 21:00
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Member Location: Posts: 2198 Joined: 18.05.10 |
I don't see a specimen with the ID cognatus in the link which one is it? But I don't have any experience with these species.
Greetings, Reinoud Field guide to the robber flies of the Netherlands and Belgium: https://www.jeugdbondsuitgeverij.nl/product/field-guide-to-the-robberflies-of-the-netherlands-and-belgium/ https://www.nev.nl/diptera/ |
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| piros |
Posted on 19-09-2019 08:29
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Member Location: Posts: 1762 Joined: 04.01.12 |
You are right, the link is useless... But please have a look at this EXL file: https://m.miketaylornaturalist.co.uk/upload/Echthistus%20cognatus%20Loew%201849.%20Figured%20diagnosis%20.4.xlsx (You have to save it first.) Edited by piros on 19-09-2019 08:31 |
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| Quaedfliegh |
Posted on 19-09-2019 19:41
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Member Location: Posts: 2198 Joined: 18.05.10 |
Thank you. If his ID is correct, I notice two things which may be inmportant. In your specimens the back of the head is hairy, in excell there are only bristles (not black?) visible. In Mike's specimen the bristles and hairs on the mesonotum are stronger and longer. This could well be the difference between the two species.
Greetings, Reinoud Field guide to the robber flies of the Netherlands and Belgium: https://www.jeugdbondsuitgeverij.nl/product/field-guide-to-the-robberflies-of-the-netherlands-and-belgium/ https://www.nev.nl/diptera/ |
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but don't see the image in the post.