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I would like to know which species this is.

It concerns this sighting:
http://observado....w/87031917
identification uncertain Chrysotoxum octomaculatum observed at 2014-07-21 BRD - Haßberge (Landkreis)





thanks in advance
Koenraad

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Right ID! It's a male C. octomaculatum

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Thank you for the confirmation, Valerio.
Ciao,
Koenraad

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Sorry but I disagree, this is not C. octomaculatum : the 3rd antennal segment is well too long and the rim of tergites 3 & 4 is not yellow at level of black front bands. Should be like in the last pictures of this page :
http://cyrille.du...illus.html

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C. cautum, I would say.

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Thank you for all the info.
OK, no C. octomaculatum.
So maybe C. cautum or fasciolatum?
This may stay uncertain with these pictures, I guess.
Regards,
Koenraad

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I enlarged the photo and I'm totally agree. 3rd antennomere is pretty long. I didn't check the photo for first steps in ID, assuming kobra did already, sorry.

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Without considering wings, cautum can be quite straight, flat abdomen fits. But wings are too much dark on the outer half of front margin. Eyes'pilosity can be a useful trait, but I cannot discriminate it with this resolution.

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Wing colours are fascicolatum-type, and enlarging the head it appears (please, would you like to check and confirm?) that 3rd antennomere is longer than 1+2. So cautum can be ruled out. I'd say C. cf. fascicolatum

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Hi again,

I have now cropped a picture of the head - I am not sure that it is clear now, since I am not a specialist, so maybe someone can confirm now?



Regards,
Koenraad