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Ventral sexing isnt my thing. A translucent molt will still show the spermatheca under magnification. I'm only guessing here but with the arch in the furrow I'd guess it's a female. @KezyGLA or @Phil are much better then I am.
I would have to agree with arachnoclown on this one. I'd say female. The shape of the furrow is that of a half moon or crescent shape. Book lung spacing also appears to be that of a female.