Published online by Cambridge University Press: 10 July 2009
The genus Sosylus includes important natural predators and parasites of ambrosia beetles (Platypodidae). Nine species of Sosylus are recorded from New Guinea (Papua New Guinea and Irian Jaya in Indonesia), and a key is provided for their identification. Five of the species, S. giluwe sp. n., S. hyweli sp. n., S. minusculus sp. n., S. morobensis sp. n. and S. reflexus sp. n., are described as new and one, S. erosus (Pasc.), is recognised as an extension to the known range of an existing species. New information is presented concerning the distribution and sexual dimorphism of the previously described species, and lectotypes are designated where necessary and feasible.