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
Utica alone escaped a similar fate and had its walls and independence
preserved to it, less perhaps from its own power than from the pious
feeling of the Carthaginians towards their ancient protectors;
in fact, the Phoenicians cherished for such relations a remarkable
feeling of reverence presenting a thorough contrast to the
indifference of the Greeks.
Even in intercourse with foreigners it is
always "Carthage and Utica" that stipulate and promise in conjunction;
which, of course, did not preclude the far more important "new town"
from practically asserting its hegemony also over Utica. Thus the
Tyrian factory was converted into the capital of a mighty North
-African empire, which extended from the desert of Tripoli to the
Atlantic Ocean, contenting itself in its western portion (Morocco and
Algiers) with the occupation, and that to some extent superficial, of
a belt along the coast, but in the richer eastern portion (the present
districts of Constantine and Tunis) stretching its sway over the
interior also and constantly pushing its frontier farther to the
south.