1	Colour yellow to orange	2
–	Colour reddish brown to black	5
2	Pilosity on scape and metatibia decumbent (Fig. 7C)	P.pulchella
–	Pilosity on scape and metatibia suberect to erect (Fig. 7A, E, G)	3
3	Smaller species (HW: 0.64–0.71) with relatively longer scapes (SI: 182–189)	P.klaman sp. nov.
–	Larger species (HW: 0.74–0.83) with relatively shorter scapes (SI: 144–174)	4
4	Head, scapes and legs very long (CI: 73–75, SI: 163–174, FI: 205–213); occipital carina broadly extended and collar-like; standing hairs acute and very abundant, present also on lower meso– and metapleuron, visible in dorsal view (Fig. 7G, H)	P.heliosa
–	Head, scape and legs relatively shorter (CI: 79–84, SI: 144–165, FI: 175–197); occipital carina narrow, not collar-like; standing hairs often apically truncated or split, generally less abundant, absent on lower meso- and metapleuron (Fig. 7E, F)	P.christinae
5	Head in full frontal view laterally with several relatively long, projecting hairs posterior of eye-level (Figs 11A, B, 12D)	6
–	Head in full frontal view laterally completely without or at most with one or two moderately long projecting hairs near eyes or towards posterior margin (Figs 11C, D, 12A, B, C)	8
6	Head shape elliptical (CI: 80–89); posterior margin relatively narrow and evenly convex; occipital carina with weak median impression, scape pilosity uniformly suberect or decumbent (Figs 11A, B, 13A, B)	7
–	Head shape broadly rounded, posterior margin not evenly convex (CI: 86–90); occipital carina without median impression; scape pilosity decumbent with additional suberect hairs on outer edge (Figs 12D, 13H)	P.setosa
7	Head relatively narrow (CI: 80–87); scapes long (SI: 153–173); scape pilosity uniformly decumbent; face almost completely and distinctly punctate (Figs 11A, 13A)	P.batrachorum
–	Head relatively wider (CI: 84–89); scapes slightly shorter (SI: 140–159); scape pilosity uniformly subdecumbent to suberect; face smooth and shiny to very faintly punctate (Fig. 11B, Fig. 13B)	P.darwini
8	Sculpture variable, but head and mesosoma never completely and coarsely punctate; at least medially between eyes and on posterior dorsopronotum superficially sculptured to smooth and shiny (Fig. 11C, D, Fig. 12B, C, Fig. 14C, D, F, G)	9
–	Head and mesosoma almost completely and coarsely punctate (Fig. 12A, Fig. 14E)	P.nimba
9	Head longer than wide (CI: 85–95), posterior margin roundly or slightly convex; scapes and mandibles moderately long (SI: 123–149, MDI: 71–78) (Fig. 11C, D, Fig. 12C)	10
–	Head almost as wide as long (CI: 94–99), posterior margin not convex, but almost straight (Fig. 12C); scapes and mandibles shorter (SI: 114–121, MDI: 68–73) (Fig. 12B)	P.rebeccae
10	Long or moderately long hairs completely absent on mesosoma and waist segments; petiole and postpetiole without laterally projecting hairs in dorsal view; metatibia pilosity appressed; second mesonotal process and sculpture on propodeum reduced; metanotal groove wide in profile; spines long (PSLI: 30–43) (Fig. 14D)	P.glabrella
–	Moderately long hairs at least present on waist segments, sometimes also on promesonotum; on petiole and/or postpetiole some laterally projecting hairs in dorsal view; metatibia pilosity decumbent; second mesonotal process and sculpture on propodeum not reduced; metanotal groove relatively narrow in profile; spines slightly shorter (PSLI: 28–32) (Fig. 14C, G)	11
11	Posterior head margin roundly convex; face and dorsal promesonotum mostly superficially punctate to punctate; second mesonotal process not raised above the level of dorsopropodeum; postpetiole relatively short (PpLI: 155–229) (Fig. 11C, Fig. 14C)	P.dea
–	Posterior head margin weakly convex, with small median impression; face and promesonotum smooth and shiny, with very few superficial punctures; in lateral view second mesonotal process distinctly raised above the level of dorsopropodeum; postpetiole relatively longer (PpLI: 129–145) (Fig. 12G, Fig. 14G)	P.semidea