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
Lastly in Sicily the straits of Messana and the larger eastern half of the island had fallen at an early period into the hands of the Greeks; but the Phoenicians, with the help of the Carthaginians, retained the smaller adjacent islands, the Aegates, Melita, Gaulos, Cossyra--the settlement in Malta especially was rich and flourishing--and they kept the west and north-west coast of Sicily, whence they maintained communication with Africa by means of Motya and afterwards of Lilybaeum and with Sardinia by means of Panormus and Soluntum. The interior of the island remained in the possession of the natives, the Elymi, Sicani, and Siceli.
After the further advance of the Greeks was checked, a state of comparative peace had prevailed in the island, which even the campaign undertaken by the Carthaginians at the instigation of the Persians against their Greek neighbours on the island (274) did not permanently interrupt, and which continued on the whole to subsist till the Attic expedition to Sicily (339-341). The two competing nations made up their minds to tolerate each other, and confined themselves in the main each to its own field.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=21