μὴ πόνει, ὦ Ξάνθια, ἀλλὰ ἔλθε δεῦρο → Don't keep suffering, Xanthias, but come here.
dat. sg. masc. et neutre de οὗτος.
dative case singular masculine or neuter of οὗτος; to (in, with or by) this (person or thing): here(-by, -in), him, one, the same, there(-in), this.
τούτῳ: dat. к οὗτος и τοῦτο.