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
Numidia - Jugurtha
The kingdom of Numidia stretched from the river Molochath to the great Syrtis,(9) bordering on the one side with the Mauretanian kingdom of Tingis (the modern Morocco) and on the other with Cyrene and Egypt, and surrounding on the west, south, and east the narrow district of coast which formed the Roman province of Africa.
9. Cf. III. VII. Numidians
In addition to the old possessions of the Numidian chiefs, it embraced by far the greatest portion of the territory which Carthage had possessed in Africa during the times of its prosperity--including several important Old-Phoenician cities, such as Hippo Regius (Bona) and Great Leptis (Lebidah)--altogether the largest and best part of the rich seaboard of northern Africa. Numidia was beyond question, next to Egypt, the most considerable of all the Roman client-states.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=26