ἐξαπιναίως —like ἐξαπίνης , found only in Thuc. and Xen. among Attic prose writers (for ἐξαίφνης or αἰφνιδίως ).
 περὶ Πελοπόννησον πλεῖν —both in 431 and 430 B.C. when the Pel. invaded Attica (II. 23, 56 ), a fleet had been sent out to make descents on the coast of the Peloponnese, as a counter-move. For the operations of this year see c. 16, 1; for those of 426 B.C. see cc. 91, 94. 
 Μαλόεις was a local name of Apollo in Lesbos; its origin is unknown.
 πανδημεί —the whole people together, not by families or clans.
 ἐλπίδα εἶναι like εἰκός ἐστι , is commonly followed by pres. or aor. infin. ἐπειχθέντας is conditional.
 ἢν μὲν ξυμβῇ . . εἰ δὲ μή —a common idiom, found already in Homer; cf. e.g. Plato, Prot. 325B ἐὰν μὲν ἑκὼν πείθηται· εἰ δὲ μή .
 εἰπεῖν —this depends on the sense of ‘order’ implied in the passage; cf. Andoc. de Myst. 20 
 ὁ γὰρ νόμος οὕτως εἷχεν· εἰ μὲν τἀληθῆ μηνύσειέ τις, εἶναι τὴν ἄδειαν, εἰ δὲ τὰ ψευδῆ, τεθνάναι . Of course εἰπεῖν = κελεῦσαι . (This passage is brief and peremptory in tone: its dramatic manner is quite characteristic, and there is no ground for suspecting the text.)