P. admiralitatum incorporates what are probably three distinct species. One of the presumed species is found in the Admiralty Islands, Bismarck Archipelago (excluding the St. Matthias Group), and the Eastern Solomon Islands from Buka to Malaita). A record of it from Bougainville Island may not be valid; it likely does occur on the island, but its presence has not been confirmed (there are five specimens from the nearby Carteret group, 90 km northeast of Buka) (S. Hamilton pers. comm.). Another presumed species occurs on the islands of Western Province, Guadalcanal, and Malaita. The third taxon occurs in the Matthias group, on Mussau and Emirau.