For those of you who don't read Myrmecos's Blog; all but the species Paratrechina longicornis have been removed from the genus. I repeat! All but that one species has been removed from Paratrechina! They are now in the genus Nylanderia which sounds a lot like Hi-lander but is Ny-lander-eye I think. Here is the abstract and you can click on the full study either by HTML or PDF.