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
Negotiations with Bocchus
Strange as it may seem, we can yet understand why the Romans now, after king Bocchus had commenced the war, began to make most zealous exertions to secure his friendship, which they had at first slighted and thereafter had at least not specially sought; by doing so they gained this advantage, that no formal declaration of war took place on the part of Mauretania. King Bocchus was not unwilling to return to his old ambiguous position: without dissolving his agreement with Jugurtha or dismissing him, he entered into negotiations with the Roman general respecting the terms of an alliance with Rome.
When they were agreed or seemed to be so, the king requested that, for the purpose of concluding the treaty and receiving the royal captive, Marius would send to him Lucius Sulla, who was known and acceptable to the king partly from his having formerly appeared as envoy of the senate at the Mauretanian court, partly from the commendations of the Mauretanian envoys destined for Rome to whom Sulla had rendered services on their way. Marius was in an awkward position.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=56