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Thanks Gabor, Kahis and Stephane for the input. H.dentipes looks about right to me, and is on my checklist. Maybe Nikita will have a look at it, as he seems to be the Dogs Bo****ks on these, going by the Gallery. Not that I doubt your judgement guys. I'm sure this little fly will be proud of his new Latin name whatever it turns out to be.
Regards Roger:)