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5505 Views 4 Replies Last post: Jul 13, 2010 12:28 PM by Rellis RSS
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Jun 29, 2010 12:01 AM

Horsefly?

What ho forum. What type of Horsefly is this? (If it actually is a Horsefly). It had just landed on my daughters back and I temporarily stunned him with a quick swat. He was about 17mm tip to toe and was found near standing water in a local park (Bexley, Kent) towards evening. Golf cub 009.jpgGolf cub 008.jpg
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    Jun 29, 2010 7:50 AM (in response to Lewis)
    Re: Horsefly?
    This is Haematopota (Tabanidae).  It's not easy to work out which, but the brown patches on the antennae indicate that it's not crassicornis, and pluvialis is the most likely candidate.
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        Jun 29, 2010 10:06 AM (in response to Lewis)
        Re: Horsefly?

        The main character used to seprarate pluvialis from other species is the shape of the first antennal segment. However, there are species that may resemble pluvialis in that aspect, as one of the characteristics of pluvialis is variability in the shape of that first segment. As a rule of thumb: pluvialis more or less has a yellowish tinge to the body colour which is absent in similar species. These all are clearly grey (lighter or darker).

         

        Paul

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          Jul 13, 2010 12:28 PM (in response to Paul Beuk)
          Re: Horsefly?
          The practicality of a "main character" which is variable and can resemble other species is questionable. Also a caution on grey or yellowish shades when studying digital photographs. These are doubtful unless the camera white balance setting (auto or manual) is accurate - for example,  if the white balance is inapt, a flash photograph will make yellowish shades more grey, a shot under most domestic lighting will make greys yellowish.
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