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A day on Salisbury Plain

Dave Gibbs and I had three days’ fieldwork together recently in Somerset, Dorset and Wiltshire. For two days we took a drenching and struggled to find any but the most ordinary invertebrates. And then on Friday 11th May we had a dry day with just enough sun to get a few butterflies on the wing. Our survey site proved to be a very interesting place on a south-facing, rabbit-grazed slope of Salisbury Plain with a very friable, chalky soil. Two new beetles for me: Ptomaphagus varicornis (Leiodidae) is a rare species (RDBK) which to the best of my knowledge has only been recorded from Surrey and Wiltshire in the last 40 years; and Stenus ochropus (Staphylinidae) which has no conservation status but must be fairly rare and has not been recorded from Wiltshire before (Darby, 2009). Dotted Bee-fly is always a superb thing to see, and I even had to stop work briefly to admire one basking on my sieving equipment!

Dotted Bee-fly Bombylius discolor

I also suction-sampled Geomyza breviseta (Opomyzidae), a Nationally Scarce fly mining grass leaves. Other scarcities on the day included the longhorn beetle Phytoecia cylindrica on Cow-parsley, the weevil Trachyphloeus aristatus*, the bee Osmia bicolor, a probable Hedge Rustic caterpillar**, the weevil Limobius borealis on Meadow Crane’s-bill, and Dingy Skipper. A single worker of the ant Stenamma debile s.s. looks like a good distributional record.

Couldn’t help but notice some big birds too …

Great Bustards

* previously determined as Trachyphloeus asperatus, re-determined and corrected on this webpage 7.vii.2012.
** Dave reared this and it was a Feathered Gothic.


1 Comment

  1. Andrew Duff says:

    FYI I found a single Ptomaphagus varicornis by sifting litter in West Norfolk 08.ix.2011. It does seem to be a very local and rare species nationally.

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