τίς αὖ: cp. O. C. 1500(Theseus entering) “τίς αὖ παρ᾽ ὑμῶν κοινὸς ἠχεῖται” “κτύπος...;” ἄντροις, poet. plur., like “δώματα, αὐλαί” ( Ant. 945), “θρόνοι” ( O. C. 425), etc. ἵσταται: cp. I. T. 1307 “τίς ἀμφὶ δῶμα θεᾶς τόδ᾽ ἵστησιν βοήν;” ἐκκαλεῖσθε: the midd. here differs from the act. ( O. T. 597 n.) only by suggesting that their own interests are involved.— κεχρημένοι. The form “κέχρημαι” (“χράομαι”) in classical prose always means either, ‘to have used,’ or ‘to have been used.’ In poetry it means also, ‘to stand in need of.’ The partic. occurs only in poetry, as Od. 1. 13“νόστου κεχρημένον”: Eur. Ion 1199“πώματος κεχρημένοι”.