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It is a pretty dark confiformis (recently stat, revived by me).
Lower callus is wrinkled, which is never seen in montana-group (including tropica)
Yes, the black on the subcallus is likely due to rubbing, but the brown in the center is not. The shape is typical for confiformis (though it can be much more extended).
That said, the dark median vitta on tergites is unusually broad.

Theo