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Thursday, 6 August 2015

Burial Park Bar

The Burial Park GMS trap this morning held new-for-year-at-the-site Small Phoenix, Iron Prominent and August Thorn, plus this Bar; after having stared at the photo, I'm thinking Lesser Treble Bar, but I would appreciate a more informed opinion (it wasn't in the best position for a photo).


Dave Morris
at

7 comments:

  1. Dave Wilton6 August 2015 at 17:46

    Not sure about that one, Dave. It is best to pot them up and then look at (or take a picture of) the underside rear of the abdomen. You can easily separate the males that way - refer to the text in the field guide for more info.

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  2. Peter Hall6 August 2015 at 19:54

    The first line is sharply and pointedly angled at 90 degrees, which would point to Lesser Treble-bar

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  3. Dave Wilton6 August 2015 at 21:39

    Personally I would never go by the angle of that cross line - too subjective.

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  4. Peter Hall7 August 2015 at 08:58

    Then perhaps you should write to Bernard Skinner

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  5. Dave Wilton7 August 2015 at 10:16

    If you have a look at Skinner's little drawings and compare them to Dave's picture you could make it fit either species.

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  6. Peter Hall7 August 2015 at 10:56

    Why don't you pot up some examples and I'll chop them Dave. But I have used this criteria for years now and there are cases where it is not clear, but the sharp point in Dave's image makes this one ok to id. If you get a selection together, I'll use Skinners references and make an id, then chop. If I get one wrong, the Mars bars are on me for 2016.

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  7. Dave8 August 2015 at 21:37

    Thanks chaps! I have previously been able to id males of these species from the "rear ends" but I didn't have a pot on this occasion.

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