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This is again from the Tusa and Royal article I keep coming back to (p. 44). Prag is Jonathan Prag of Merton College, Oxford. I came back to this passage after reading this portion of Walbank’s Commentary:
The Livy Epitome (15.8) is really so short as to be down right useless:
Quaestorum numerus ampliatus est, ut essent octo.
The number of quaestors was doubled so that there were eight.
But Lydus, On Magistrates (1.27) is more interesting:
Modern critical edition, translation, and commentary available here (p. 41-45).
Le Bohec, Yann. – La marine romaine et la première guerre punique. Klio 2003 85 (1) : 57-69 carte.
Harris W. V. – The development of the quaestorship, 267-81 B.C. Classical Quarterly 1976 XXVI : 92-106. Abstract: There were two new quaestorships in 267, not four, as usually supposed, and they probably shared some of the duties of the quaestores urbani. Two more quaestorships were added for Sicily and Sardinia, and in 197 the total was probably raised to ten, a figure maintained until Sulla. The quaestores classici of 267 probably represented a tightening of Roman control in Italy.