Herbert Weir Smyth, A Greek Grammar for Colleges

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[*] 163. The antepenult, if accented, can have the acute only (ἄνθρωπος, βασίλεια queen, οἰκοφύλακος of a house-guard). If the ultima is long, either by nature or by position (144), the antepenult cannot take an accent: hence ἀνθρώπου (176 a), βασιλεία_ kingdom, οίκοφύλαξ.

a. Some nouns in -εως and -εων admit the acute on the antepenult. Thus, the genitive of nouns in -ις and -υς (πόλεως, πόλεων, ἄστεως), the forms of the Attic declension, as ἵ_λεως (289). So the Ionic genitive in -εω (πολί_τεω); also some compound adjectives in -ως, as δύσερως unhappy in love, ὑψίκερως lofty antlered. On ὧντινων see 186.