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If you'd checked the forum archive, you'd have found that many Thecophora requests remained unanswered... It is a very tricky genus, and the experts agree that only females can be identified from photos by the shape of their genitalia. So your male hardly has a chance.
This said, the key https://home.hccn...phora.html offers a small chance to approach the males, if there is a good view of the top of the thorax (two grey dust stripes flanking a middle black stripe or two black stripes in a grey field of dust). Sorry, but I cannot decide which to choose. So I followed both paths and got to T. distincta on the one hand and T. atra on the other, which brings us back to the starting point :|
If this is T. distincta: https://diptera.i...;pid=75178 or https://diptera.i...pid=311780, it looks a bit different as to the dusting. On the other hand, the pictures of T. atra males in https://www.flick...219920050/ look rather similar. So you could label your picture "T. cf. atra", but keep in mind that a mere comparison of pictures is no certain identification at all!
Regards, Sundew