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P. synonyma do not have bicoloured antennae (Qiao, 1995), contrary to P. solida whose color is thus defined : "Head, apical half of scape, pedicel and apical fifth of segments 3-9, raised nodules, collars and spines of pronotum, central metasternum, legs and apical third of each abdominal sternite reddish brown."
The insect above fits well with this last species.