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Diptera.info :: Family forums :: Asilidae Forum
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Echthistus from Rhodes
piros
#1 Print Post
Posted on 10-09-2019 19:18
Member

Location: Hungary
Posts: 1614
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
piros attached the following image:


[275.26Kb]
Edited by piros on 10-09-2019 19:23
 
piros
#2 Print Post
Posted on 10-09-2019 19:23
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Location: Hungary
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Head.
piros attached the following image:


[298.43Kb]
Edited by piros on 10-09-2019 19:30
 
piros
#3 Print Post
Posted on 10-09-2019 19:30
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Location: Hungary
Posts: 1614
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Pair:
piros attached the following image:


[250.68Kb]
 
piros
#4 Print Post
Posted on 17-09-2019 19:51
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Location: Hungary
Posts: 1614
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Nobody? Frown
 
Quaedfliegh
#5 Print Post
Posted on 18-09-2019 19:58
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Location: Tilburg Netherlands
Posts: 1965
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/
 
Mariastraat 12
piros
#6 Print Post
Posted on 18-09-2019 21:32
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Location: Hungary
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Thank you for you reply!
"I would love to hear...."
So would I! Smile

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 21:56
 
piros
#7 Print Post
Posted on 18-09-2019 21:45
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Location: Hungary
Posts: 1614
Joined: 04.01.12

BTW, this fly is definitely larger than E. rufinervis I am used to.
 
Quaedfliegh
#8 Print Post
Posted on 18-09-2019 22:00
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Location: Tilburg Netherlands
Posts: 1965
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/
 
Mariastraat 12
piros
#9 Print Post
Posted on 19-09-2019 09:29
Member

Location: Hungary
Posts: 1614
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 09:31
 
Quaedfliegh
#10 Print Post
Posted on 19-09-2019 20:41
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Location: Tilburg Netherlands
Posts: 1965
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/
 
Mariastraat 12
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