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The submarginal row of spots in space 3-5 HW is irregular in size and position in P. grandis; it is more even in P. australis.
The submarginal row of spots in space 3-5 HW is irregular in size and position in P. grandis; it is more even in P. vitreus.
The submarginal row of spots in space 3-5 HW is irregular in size and position in P. grandis; it is more even in P. ecitonorum.
The submarginal row of spots in space 3-5 HW is irregular in size and position in P. grandis; it is more even in P. confusis.
The submarginal row of spots in space 3-5 HW is irregular in size and position in P. grandis; it is more even in P. albiapicalis.
The submarginal row of spots in space 3-5 HW is irregular in size and position in P. grandis; it is more even in P. rilma.
The hyaline streak in space 2 FW is deeply divided in P. marshalli; in P. grandis it is only indented slightly at its outer end. Also, the submarginal row of spots in space 3-5 HW is irregular in size and position in P. grandis; it is more even in P. marshalli.
In P. obscurior, the hyaline streak in space 2 FW is deeply divided, while in P. grandis it is only shallowly indented at the outer end.