There is variability in the concavity of the spots in Potanthus.
I also thought your other Potanthus in the other thread might be trachala at first, as the underside is very similar. Most trachala seen here doesn't have the 2 spots in space 4 & 5 quite detached from the subapical group.
This one have the veins darkened across all the spots including the 3 subapical spots, so it is P. omaha.
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