What's κᾆθʹ -- Aristophanes Thesmophoriazusae 486

Specific Text Questions
1

Folks,

What’s κᾆθʹ on line 486:

κᾆθʹ ὁ μὲν ἔτριβε κεδρίδας ἄννηθον σφάκον

Mark

2

καὶ εἶτα, normal crasis.

3

Thanks! I found the reference to crasis with kai in Smyth, 68c.