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Xanthandrus comptus

 
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Peter Follett



Joined: 08 Aug 2006
Posts: 18
Location: Dorking

PostPosted: Tue Jul 10, 2007 8:40 am    Post subject: Xanthandrus comptus Reply with quote

A female of Xanthandrus comptus taken in a garden near Dorking, Surrey on the 7/7/2007 in company with Scaeva pyrastri and a Humming Bird Hawkmoth, could this mean a migration occured?
Peter
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Roger K.A. Morris



Joined: 06 Nov 2005
Posts: 1583

PostPosted: Sat Jul 21, 2007 2:09 pm    Post subject: Reply with quote

Hello Peter

This has been a good year for Xanthandrus, so it is possibly a resident species at the moment - there are records of larvae associated with web-forming lepidoptera larvae on ivy.

I've seen it twice this year - and only twice previously in 20 years recording!

Regards

Roger
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John O'Sullivan



Joined: 05 Oct 2005
Posts: 128
Location: Sandy, Bedfordshire, UK

PostPosted: Thu Jul 26, 2007 9:49 pm    Post subject: Xanthandrus comtus Reply with quote

Thanks both.

Yes, as Roger says, this has been a good year for the species. I know of three individuals from two sites in Bedfordshire in June, all of them females. One, closely examined, had no pale markings at all on tergite 2. In a glass tube, this individual repeatedly flashed open its wings, otherwise held folded over the body, perhaps suddenly to reveal the tergite markings. One speculates that such behaviour is used to startle a potential predator at the sudden appearance of "eyes" (in this case, four of them).

Happy hunting!

John
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