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Diptera.info :: Family forums :: Syrphidae
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Chrysotoxum fasciolatum
Jef Hendrix
#1 Print Post
Posted on 26-07-2013 13:35
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Location: Turnhout, Belgium
Posts: 60
Joined: 17.06.11

 A Chrysotoxum from the eastern Pyrenees near Prades (France) at an altitude of +-1500m.
12/07/2013
Can anyone help?

Jef
Jef Hendrix attached the following image:


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Edited by Jef Hendrix on 29-08-2013 09:02
 
Jef Hendrix
#2 Print Post
Posted on 26-07-2013 13:36
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Location: Turnhout, Belgium
Posts: 60
Joined: 17.06.11

 2
Jef Hendrix attached the following image:


[174.61Kb]
 
Sundew
#3 Print Post
Posted on 27-07-2013 14:35
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Location: Berlin and Baden-Württemberg, Germany
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 Indeed a female Chrysotoxum. With the key http://web.archiv...x_key.html, I arrive at Chrysotoxum cautum, as the third antennal segment seems to equal segments 1 + 2. Unfortunately, I cannot see the character: "female: unique among European Chrysotoxum in possessing a longitudinal, median, membranous strip on abdominal tergite 6, which effectively divides this tergite into two parts". Also the scutellum is unusually dark. So here I am at my wits' end!
Regards, Sundew
 
Gerard Pennards
#4 Print Post
Posted on 27-07-2013 18:41
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 It's a female Chrysotoxum fasciolatum... :-))
Greetings,
Gerard Pennards
 
Sundew
#5 Print Post
Posted on 27-07-2013 19:36
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 Ah - in this case "Wing: front margin yellowish with a distinct dark spot in the top half; abdomen elongate; large species: 13-17 mm" is a good description in the key. As to the antenna, segment 3 has to be longer than 1 + 2 to get to Ch. fasciolatum. So my estimation was wrong awkward.
Good to have true experts here!
 
Jef Hendrix
#6 Print Post
Posted on 29-08-2013 09:06
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Location: Turnhout, Belgium
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Joined: 17.06.11

 Thanks Sundew and Gerard!
 
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