1	Colour yellow to orange	2
–	Colour reddish brown to black	4
2	Antennal scrobe conspicuous; sides of head without laterally projecting hairs in full–face view (Fig. 6A, E)	3
–	Antennal scrobe absent or inconspicuous; head in full–face view with laterally projecting hairs (Fig. 6C)	P.heliosa
3	Smaller species (HW: 1.65–1.75), with more elongated head (CI: 88–93) and relatively longer scapes (SI: 62). Mesonotum to propodeum strongly punctate. Face sculpture in posterior third with faint incomplete longitudinal rugulae at most, posteriorly reduced to weak, superficially reticulate punctures (Fig. 6B)	P.klaman sp. nov.
–	Larger species (HW: 2.0–2.28) with broader head (CI: 98–104) and relatively shorter scapes (SI: 51–56). Mesonotum to propodeum weakly punctate. Face sculpture in posterior third longitudinally rugose and weakly to superficially punctate, posteriorly changing to obliquely and weakly rugulose (Fig. 6D)	P.pulchella
4	Posterolateral lobes partly smooth and shiny (Fig. 8B, E)	5
–	Posterolateral lobes variably sculptured, never smooth and shiny, from punctate to longitudinally rugulose (Fig. 8A, C, D, F)	6
5	Lateropronotum alutaceous to reticulated, sometimes with transverse rugulae (Fig. 9B). Head above the eyes rugulose, central rugulae between the frontal ridges reaching the occipital line, occipital corners alutaceous to smooth (Fig. 8B, Fig. 10B)	P.darwini
–	Lateropronotum glassy smooth (Fig. 9B). Head above the eyes faintly sculptured to smooth, central rugulae between the frontal ridges failing to reach the occipital line, occipital corners glassy smooth (Fig. 8E, Fig. 10E)	P.rebeccae
6	Scape and metatibia pilosity fine and inconspicuous, mostly fully appressed; long standing hairs absent on promesonotum (Fig. 9D)	P.glabrella
–	Scape and metatibia pilosity conspicuous and decumbent; standing hairs often present on promesonotum (Fig. 9A, C, F)	7
7	Posterolateral lobes of head longitudinally rugose, the rugulae similar to those in the rest of the head, with spaces between rugae weakly to superficially punctate (Fig. 8C)	P.dea
–	Posterolateral lobes of head punctate, overlain by superficial rugulae (Fig. 8A, F)	8
8	Central rugulae on the head running to occipital line, sometimes broken, separated apart with wide spaces between them, some transverse rugulae may appear on the upper third of the head, but without creating a reticulum (Fig. 8F)	P.semidea
–	Central rugulae on the head not reaching the occipital line, close together and not leaving wide spaces between them and without transverse rugulae of any kind (Fig. 8A)	P.batrachorum