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Diptera.info :: Family forums :: Syrphidae
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Spearhorn ID? (Ketton Rutland)
Gman
#1 Print Post
Posted on 19-07-2022 23:35
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Hi All

Came across a number of these hoverflies that I haven't seen before
I think they are Chrysotoxum festivum (Hook-barred Spearhorn).

Could some confirm or put me straight please?

Yours, Gareth
Gman attached the following image:


[111.07Kb]
 
Sundew
#2 Print Post
Posted on 21-07-2022 01:55
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Location: Berlin and Baden-Württemberg, Germany
Posts: 3917
Joined: 28.07.07

With the distinct downturned bars on segments T2-4 and wholly orange legs, this is a female of Chrysotoxum festivum indeed.
It pays to look at the key https://books.goo...&hl=de, however. It lists the most important characters, starting with the length of the three antennal segments. If I photograph a Chrysotoxum, I always try to get a good shot of the antenna. Then, a lateral shot of the thorax should show if there are yellow spots and how the femora are coloured. One picture is not enough for identification in most cases!
Regards, Sundew
Edited by Sundew on 21-07-2022 01:56
 
Gman
#3 Print Post
Posted on 21-07-2022 15:37
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Hi Sundew

Thanks for the confirmation and information. Normally I have40-50 pics per invidual hoverfly but these hoverflies stayed in the medium grass,
in shade on one of the hotest days on record. They were constantly on the move and impossible to get moe helpful angles.

I struggle with keys, I usually use pictures from variouis books like Ball & Morris, and also Steven Falk's Flickr page - an amazing resource!

Thanks again, Gareth
 
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23.06.25 18:10
If you have some spare money, there is a copy (together with keys to pupae and larvae) for sale by Hermann L. Strack, Loguivy Plougras, France

23.06.25 11:18
Appreciate it, Tony Irwin! I got the hint to use the key next to Langton and Pinder key for females of Chironomidae. So no specific queries, except the keys... I will keep this on my list and hope th

19.06.25 15:33
I have the hard copy book, if you have any specific queries, but I'm not scanning the 500+ pages!

02.06.25 18:26
Anyone has "Chironomidae of the Holarctic region. Keys and diagnoses. Part 3. Adult Males Entomologica Scandinavica Supplement 34"? smolwaarneming@gma
il.com

28.05.25 20:57
I have Russian Coenosia. nikita6510@ya.ru

28.05.25 12:25
Is someone able to share with me "A key to the Russian species of the genus Coenosia"?

08.05.25 18:22
I have

03.05.25 08:35
Does someone has a scan of Nartshuk E.P. 2003. Key to families of Diptera (Insecta) of the fauna of Russian and adjacent countries. Proceedings of the Zoological Institute Vol. 294: 1-252 for me?

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