LSJ
Ion. for ἔπειτα, thereafter, prob. in Hdt. 1.146, 2.52, al., cf. SIG 2660.2 (Milet., iv BC), but ἔπειτεν is Ion. acc. to Ael. Dion. Fr. 158; Dor. ἔπειτεν Pi. P. 4.211, N. 3.54, al., Ar. Ach. 745, IG 5(1).1390.28 (Andania).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)