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
To this fell to be added the sovereignty of Carthage over the other Phoenicians in Africa, or the so-called Liby-phoenicians. These included, on the one hand, the smaller settlements sent forth from Carthage along the whole northern and part of the north-western coast of Africa--which cannot have been unimportant, for on the Atlantic seaboard alone there were settled at one time 30,000 such colonists --and, on the other hand, the old Phoenician settlements especially numerous along the coast of the present province of Constantine and Beylik of Tunis, such as Hippo afterwards called Regius (Bona), Hadrumetum (Susa), Little Leptis (to the south of Susa)--the second city of the Phoenicians in Africa--Thapsus (in the same quarter), and Great Leptis (Lebda to the west of Tripoli).
In what way all these cities came to be subject to Carthage--whether voluntarily, for their protection perhaps from the attacks of the Cyrenaeans and Numidians, or by constraint--can no longer be ascertained; but it is certain that they are designated as subjects of the Carthaginians even in official documents, that they had to pull down their walls, and that they had to pay tribute and furnish contingents to Carthage.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=14