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Both pantherinus and nigrifrons shares many features. But apparently only the latter female has both middle and hind tibiae with dark spots at the middle (with the hind tibia with a black spot), while the former has only has "hind tibia darkened in the middle". Here hind tibia appears with a darker spot, while fore and middle tibiae have a kind of brownish spot (anyways there's always the risk that it's due to photo effects).