I've been trying to make sense of those "Sarmatian" references in the Tabula Peutingeriana (other than to the Roxolani) which might have "ethnic" implications for historical IE reconstructions, inc. of course the mysterious "Venedae Sarmatae". I tried all sorts of possible combinations re the "Lugiones Sarmatae" but they all seemed strained somehow. And then I stumbled upon this text:
http://mek.niif.hu/03400/03407/html/14.html
Since the TP is above all a road map (a practical traveller's guide), and since acc. to the text above there was an Apulum to Lugio road (unmarked but partly 'protected" something like the stations in the Old American West), could "Lugiones Sarmatae" simply refer to those Sarmatians who were in some way connected to that road, perhaps even (in the post-271 period) as "guides" or "guardians"?
Perhaps this might apply by analogy to the "Venedae Sarmatae"? I.e. also somewhere near Apulum, travellers might connect with "Sarmatians" who could guide them along the "road to the Venedae"? Perhaps in the Ptolemaic sense of the amber coast?