Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Italy and the Provinces
It is true that this thorough distinction between the communities that furnished contingents and those that paid tribute, or at least did not furnish contingents, was not in law necessarily coincident with the distinction between Italy and the provinces. Transmarine communities might belong to the Italian confederacy; the Mamertines for example were substantially on a level with the Italian Sabellians, and there existed no legal obstacle to the establishment even of new communities with Latin rights in Sicily and Sardinia any more than in the country beyond the Apennines.
Communities on the mainland might be deprived of the right of bearing arms and become tributary; this arrangement was already the case with certain Celtic districts on the Po, and was introduced to a considerable extent in after times. But, in reality, the communities that furnished contingents just as decidedly preponderated on the mainland as the tributary communities in the islands; and while Italian settlements were not contemplated on the part of the Romans either in Sicily with its Greek civilization or in Sardinia, the Roman government had beyond doubt already determined not only to subdue the barbarian land between the Apennines and the Alps, but also, as their conquests advanced, to establish in it new communities of Italic origin and Italic rights.
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Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=16