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Philodromus species are difficult to tell apart, even under the microscope. How have you decided this is cespitum and not, say, aureolus?
I appreciate the problems with spider idents. Being old enough and wise enough to know you cannot know it all, I take photo's then try to match them up with books and images on the web. Then putting them on i-Spot trails my ident with other peoples ideas to perhaps thrash out the true identity.
Lat/Lng: 51.91089, 0.92078
OS grid ref: TM009276