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This from chalk grassland in S UK (Surrey), in early-mid September. Sems too yellow for C. festivum but not really right for C. cautum either? Could it be C. elegans?

BW
Tristan

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I don't think that is festivum, because the yellow markings reach the margins of the abdomen. but in my opinion either cautum is: the first antennal segment is as long as 2th. what about octomaculatum?could it be?

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yes, that sp is possible, although it was not on a heathland site. C. elegans fits the habitat better (lowland calcareous grassland).

here's another image

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Well, it seems to be a female of elegans or veralli.
Looking at tergite two were the black band on the front seems to be rather straight, I think this is a female Chrysotoxum verralli!
Greetings,

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Hi Tristan,

My first thought was Chrysotoxum fasciolatum, but looking closer I think it's either C. octomaculatum or C. verralli. And I think the latter fits best!

Edit: It seems Gerard has beaten me. But 2 for verralli: That's a comfirmation, I guess?!

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I would agree re black band and antennal segments are equal in length. Many thanks Gerrard & Iolaire!

BW
Tristan