Abbreviated from Harpokration s.v., commenting on the appearance of this toponym in Demosthenes 21 (at chs. 132 and 164) and citing the local historian Aristoteles of Chalkis [Myth, Place] (FGrH 423 F1). The name, all other sources (including Stephanus of Byzantium) agree, was Argoura, not the Suda's Argousa (or in one manuscript Argousai).
For Euboia see generally epsilon 3382; for Chalkis see under chi 43 and chi 46. Argoura, strictly speaking, was not a city (polis) but a sub-polis settlement: see K. Reber, M.H. Hansen and P. Ducrey in M.H. Hansen and T.H. Nielsen (eds.), An Inventory of Archaic and Classical Poleis (Oxford 2004) 644.