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This is a female. The spider can change its colour to some extent to match its surroundings, it can be yellow, white or greenish. Some have red anterior lines or spots which can vary in intensity, this specimen is particularly well marked.
A great image by the way.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
with the species, but love the photo. I am also interested in the comment about its chameloinic (if that's the word) abilities.
Lat/Lng: 51.1247, -2.7429
OS grid ref: ST481364