P. ochrognathum group

10 T1 with lateral yellow spot; scutum and scutellum with shallow, often scattered punctation......................... 11

– T1 black; scutum and scutellum with dense, regular punctation; combs at the base of S5 separated by less than one comb width.................................................................................... P. beaumonti

11 Ground colour of terga black; median combs at the base of S5 separated by 3–4 comb widths............ P. ochrognathum

– Tergal discs black, depressions bronze-coloured; median combs at the base of S5 separated by 6–8 comb widths................................................................................................... P. rubellulum