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I've been looking for Microdon for ages without luck, fantastick photo.
I'm not sure this is M. analis - if it is then it is a very unusual record because it is about 200 miles from its known location.
I would like to take a look at a higher resolution photographas it might be M. devius, which is strangely more likely.
roger dot morris at dsl dot pipex dot com (Hoverfly Recording Scheme)
I am afraid this photo is the only one that came out reasonably clearly.
These insects were gathered ,mostly in pairs, around an old tree stump
in the heathland bog area of Black Park nature reserve .There were probably thirty or so all together ,if I re-visit this week and they are still present ,I'll take some more shots.
It would be very helpful to secure a specimen - a sound ID is really needed as this is quite an important new locality.
Might be worth looking under the bark of the stump - that would clinch it if you could find vacated pupae - they should be pretty obvious - they look like small reticulate tanks.
Also, I misread Wexham for Wrexham. Slough area still very interesting though and an important find - the management of the site will have a bearing on the fly.
I have been back to the place where I first saw the insects and only managed one viewing of a pair this time .I am not sure the shot is a great deal better ,but it gives a few more features .The tree stump is fairly rotten and bark free ,so I don't think I would have much luck with the pupae .Anyway hope the photo is of some use.There doesn't seem to be a way of attaching an image to this message .so I will put it in observations.
Just posted a Microdon sp photo I saw today on a pine stump on a Dorset heath. It was investigating holes in the stump. Probably M. analis.
Just wondered if you remember the behaviour of these (apart from mating!)? Were they investigating the ants at the base/side of the stump, or just clustering around the top? Were there holes in the stump?
I realise it is a long time ago!
Jamie from Briantspuddle
Lat/Lng: 51.54, -0.5426
OS grid ref: TQ011833